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zjc26138
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Loc: Mingo Junction, Ohio
New Celestron OAG is shipping.
      #5950153 - 07/01/13 06:39 PM

The new Celestron OAG is now shipping. Mine should ship out today or tomorrow from OPT. With any luck I'll get it before the weekend and maybe get some clear skies as well.

Just in case anyone else wants this new OAG, OPT has plenty more in stock.


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David PavlichAdministrator
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Re: New Celestron OAG is shipping. new [Re: zjc26138]
      #5950563 - 07/01/13 11:27 PM

Getting serious about this imaging stuff, Zach?

David


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MikeCMP
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Reged: 07/12/11

Loc: Chardon OH
Re: New Celestron OAG is shipping. new [Re: David Pavlich]
      #5950574 - 07/01/13 11:35 PM

That looks like a nice OAG for the price. Keep us posted n how this works out, this is on my list of toys for one day...

Mike


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zjc26138
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Re: New Celestron OAG is shipping. new [Re: MikeCMP]
      #5950591 - 07/01/13 11:50 PM

David- I guess so. I want to be able to get 3-4 minute
guided subs. Right now I get 60-90s max at 2032mm. Next on my list is new guiding camera. Then maybe a modified DSLR or CDD. Of course if I go the CCD route I'll get hyperstar as well. Astrophotography is a sickness.

Mike- Will do. Though the forecast for the next ten days is rain everyday. Hopefully I'll get a chance to test before to long.


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MikeCMP
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Reged: 07/12/11

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Re: New Celestron OAG is shipping. new [Re: zjc26138]
      #5950876 - 07/02/13 08:17 AM

Now I know why your forecast is the same is mine, you're in Ohio too

Good luck with your imaging. The part that took me the longest was figuring out how to frame and focus everything. Do you use a guide scope now? Have you used a OAG before? And what guide camera are you going to use?

I'm curious as to whether celestrons included adapters will let you reach focus with the guide cam and your imaging cam at the same time. Seems promising looking at the list of included adapters.

Mike


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zjc26138
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Re: New Celestron OAG is shipping. new [Re: MikeCMP]
      #5950965 - 07/02/13 09:25 AM

Mike- Yeah sorry about bringing all the clouds to Ohio. Usually when I buy something it's clear out, but doesn't look that way this time.

Yeah it took me awhile to understand the framing and focus part, but luckily BYEOS makes this much easier. I don't use any guide scope when imaging with my Edge 8. Because of that I've been limited to really short exposures. When imaging with my TMB I use a guide scope and have had really good results with it.

This will be my first experience using an OAG, so I'm not sure what to expect. I use a SSAG, but I've heard it's not sensitive enough to use with an OAG. Hopefully that is not the case, because a new autoguider is not the budget right now.


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jgraham
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Re: New Celestron OAG is shipping. new [Re: zjc26138]
      #5951702 - 07/02/13 04:38 PM

This time of year if it t'ain't the clouds it's the skeeters.

Congrats on the new OAG! Mine (Orion, not Celestron) worked like a charm on my 8" and 10" SCTs.

Get ready for the skies to clear... I'm going to send my camera out for modding and I'm sure the skies will be pristine while its gone!

(Shhh, I'm hiding a second camera under my scope...)


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zjc26138
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Re: New Celestron OAG is shipping. new [Re: jgraham]
      #5951825 - 07/02/13 06:05 PM

Yeah clear summer nights in Ohio are hard to come by. The skeeters are really bad this year. Time to buy some thermacell.

Thanks! I'm hoping it works well with my SSAG. If it doesn't, well I guess I'll have to find something else. Haha. Of course the skies will clear as soon as your camera gets sent out. Then that will give me
Enough time to try out my OAG.


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sage


Reged: 08/31/11

Loc: Houston, Texas, USA
Re: New Celestron OAG is shipping. new [Re: zjc26138]
      #5952199 - 07/02/13 10:32 PM

That's good news! I ordered mine from Adorama about two months ago, but haven't heard from them yet. Hopefully soon! I had about given up on this... I really hope this turns out to be a winner!

Edited by end (07/02/13 10:38 PM)


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zjc26138
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Re: New Celestron OAG is shipping. new [Re: end]
      #5952305 - 07/02/13 11:42 PM

It is indeed good news. . I'd give Adorama a call and see if they have it stock now. I figure it's a good chance they do. I'm hoping it turns out to be a winner also. Celestron has a winner in the Edge ota's. So hopefully this one will be as well.

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Wmacky
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Re: New Celestron OAG is shipping. new [Re: zjc26138]
      #5952660 - 07/03/13 08:14 AM

I know many are excited about the OAG, but why? I'm in the market, and not sure what makes one great? I know sturdy is a factor as well as thickness. I was looking at the TS9 or the Olivian? copy.

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sage


Reged: 08/31/11

Loc: Houston, Texas, USA
Re: New Celestron OAG is shipping. new [Re: Wmacky]
      #5952717 - 07/03/13 08:56 AM

For myself, all I can say is that I'm hoping it is great. Obviously I haven't tried it and there aren't any reviews available. It is a leap of faith.

The reasons I'm hoping this is good for me is that I really don't want to deal with trying to optimize the back focus distance on my 11" EdgeHD scope. My impression is that this one comes with the proper adapters and what not to make the distance to camera sensor appropriate for my system. Clearly there are other ways of making this work, but I'd like a system to work "out of the box".

I'm going to be away from my telescope until early August, but I'll be focusing all my attention on getting this to work when I return.

I would imagine that by the end of August there will be several reports here that will let people know if this is a good OAG setup or not without much leaping involved.


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zjc26138
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Re: New Celestron OAG is shipping. new [Re: Wmacky]
      #5952801 - 07/03/13 09:55 AM

Quote:

I know many are excited about the OAG, but why? I'm in the market, and not sure what makes one great? I know sturdy is a factor as well as thickness. I was looking at the TS9 or the Olivian? copy.




I choose it because it looks to be matched to the Edge line of scopes and its price did not break the bank.


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freestar8n
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Re: New Celestron OAG is shipping. new [Re: Wmacky]
      #5953161 - 07/03/13 01:43 PM

I have used a number of different OAG's - and a good one does make a difference. Main things to look for are: It should be thin so it doesn't take up too much backfocus, but it should still have a decent sized mirror/prism and a wide path to the guide chip so it can receive a wide cone of light. The prism height should be adjustable easily. There should be good rotation on each side of the OAG to set the guide angle and the image angle. It should be easy to install degree indicators to set the oag angle ahead of time. The rotation should be smooth and lockable. You shouldn't need to pay extra for 7 weird couplings to make it work with your system. The focuser should be smooth and - ideally - helical while not taking up too much space on the guider side. Being able to set the pickoff angle is desirable but adds complexity. And it should be rigid.

So I think a good one makes a difference - and some of them really do cost a lot. I haven't tried this one.

Frank


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David PavlichAdministrator
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Re: New Celestron OAG is shipping. new [Re: zjc26138]
      #5953271 - 07/03/13 02:39 PM

You will post pictures and give a first light report.

David


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zjc26138
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Loc: Mingo Junction, Ohio
Re: New Celestron OAG is shipping. new [Re: David Pavlich]
      #5954123 - 07/04/13 12:40 AM

Frank- I've never dealt with OAG's before so I'm sure I'll be reading the manual several times to figure everything out. Also I'll probably be asking a ton of questions here on CN. The Celestron seemed to be a good price for whats being offered. Hopefully it works well.

David- Of course of course! Though everyday for the next ten days has 40-50% chance of rain forecasted. It's supposed to arrive Tuesday. I'm hoping I'll get some clear skies later in the week to test it out.


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sage


Reged: 08/31/11

Loc: Houston, Texas, USA
Re: New Celestron OAG is shipping. new [Re: zjc26138]
      #5956342 - 07/05/13 04:28 PM

I just got notification from Adorama that my OAG is shipping too. It will arrive at my place just as I leave town for three weeks. Typical. At least no one here needs to worry about clouds due to my purchases...

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zjc26138
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Re: New Celestron OAG is shipping. new [Re: end]
      #5956868 - 07/05/13 10:58 PM

Hopefully it will be clear when you return to town. Mine is still supposed to arrive Tuesday. And hopefully first light the following weekend.

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zjc26138
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Re: New Celestron OAG Arrived! new [Re: zjc26138]
      #5963245 - 07/09/13 11:37 PM

My OAG arrived today. It looks and feels like a nice solid piece of equipment. I'll take some pictures of it tomorrow. I'm hoping to test it out Thursday during the day. I'm thinking Thursday or Saturday night for first light.

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sage


Reged: 08/31/11

Loc: Houston, Texas, USA
Re: New Celestron OAG Arrived! new [Re: zjc26138]
      #5963708 - 07/10/13 09:32 AM

That's great! Mine is actually supposed to arrive today (two days ahead of schedule) so I might actually be able to do a quick first light with it tonight if everything else cooperates perfectly.

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zjc26138
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Re: New Celestron OAG Arrived! new [Re: end]
      #5964004 - 07/10/13 12:46 PM

That's great also. Hopefully it does arrive today. It's supposed to be clear Thursday-Sunday for me. So I should plenty of time to test it out.

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sage


Reged: 08/31/11

Loc: Houston, Texas, USA
Re: New Celestron OAG Arrived! new [Re: zjc26138]
      #5964555 - 07/10/13 06:44 PM

Mine just arrived! Here are some unboxing pictures:

http://triplehelix.rice.edu/~jdhartgerink/astronomy/oag_unboxing/


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sage


Reged: 08/31/11

Loc: Houston, Texas, USA
Re: New Celestron OAG Arrived! new [Re: end]
      #5964601 - 07/10/13 07:20 PM

The pictures linked above are probably more valuable than anything I'll say here, but I'm quite happy with the quality of the build. Fully assembled the system is very rigid and still allows for helical focusing of the guide camera and 360 degree rotation of the pickoff mirror to allow more flexible guide star selection.

The main reason I bought this system was to have an OAG that had the proper back focus for my canon out of the box rather than having to make compromises or purchasing a large number of adapters from third parties. On that front this is certainly a success. For people who have limited back focus distance available to them this is NOT going to be a good OAG to buy. It will also probably be difficult to work with filter wheels. But in my case with a Canon 60Da as the imaging camera and using Astronomic EOS clip in filters, it may be just about perfect.

Of course, all of this is meaningless unless the pictures come out looking good. Unfortunately tonight is the only night I have to test it before going out of town for three weeks... If I have the opportunity to do a first light, I'll post back here again.


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zjc26138
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Loc: Mingo Junction, Ohio
Re: New Celestron OAG Arrived! new [Re: end]
      #5964893 - 07/10/13 10:45 PM

Glad your OAG arrived and I hope you are having a good first light! What scope are you going to use with it?

I agree that this system seems is robust. Plus it comes with a whole slew of adapters. I'm hoping for first light tomorrow night with my Edge 8, T1I, and SSAG.


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sage


Reged: 08/31/11

Loc: Houston, Texas, USA
Re: New Celestron OAG Arrived! new [Re: zjc26138]
      #5965001 - 07/10/13 11:45 PM

Well, no first light for me tonight. Ran into a problem with my mount and don't have the time to trouble shoot. Unfortunately that means a three week delay for me...

I'll be using this on an Edge 11, Canon 60Da and SSAG. The mount gave me problems just at the point where I had achieved focus in both the guider and camera... the fun was about to begin and now this. Oh well.

Good luck on your end!! It has to be better luck than mine!

By the way, I think there is an error in the manual that comes with the guider. If you look at the figure for setting up with an Edge 8 vs. an Edge 11, the suggested adapters are identical even though the suggested back focus is different. I confirmed that the figure for my Edge 11 gave the proper back focus distance, but you might want to actually measure the setup you get with your 8 because to me it looks like if you use their suggestion you are going to be too long and will want to use one of the shorter spacers.


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zjc26138
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Re: New Celestron OAG Arrived! new [Re: end]
      #5965685 - 07/11/13 01:18 PM

Sorry you didn't get first light. I still haven't tested the OAG in the daylight. I probably should that way I won't have an hiccups when I get clear skies.

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crow
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Loc: BC, Canada
Re: New Celestron OAG Arrived! new [Re: end]
      #5966127 - 07/11/13 05:49 PM

Thanks for the pics, really helpful. Looks like a nice piece of kit.

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zjc26138
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Re: New Celestron OAG Arrived! new [Re: crow]
      #5967149 - 07/12/13 10:36 AM

First light was not the best, even though it was a gorgeous night. I could not find guide stars to save my life. I tired several targets and could not find any stars. I think the SSAG might not be sensitive enough. I'll try again tomorrow night. I'll put an eyepiece in the autoguider spot first and find stars, then give the SSAG a try. I did not do that last night.

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rmollise
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Re: New Celestron OAG Arrived! new [Re: zjc26138]
      #5967297 - 07/12/13 12:10 PM

You will need to be close to focus to see much of anything. Best bet? Get a bright star on the guider prism and focus the camera on that.

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zjc26138
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Re: New Celestron OAG Arrived! new [Re: rmollise]
      #5967438 - 07/12/13 01:38 PM

Thanks for the advice Rod. It's supposed to be clear the next couple of nights, so I'll have a good amount of time to test it out.

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rmollise
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Re: New Celestron OAG Arrived! new [Re: zjc26138]
      #5967677 - 07/12/13 03:36 PM

Quote:

Thanks for the advice Rod. It's supposed to be clear the next couple of nights, so I'll have a good amount of time to test it out.




It's a pain in the you know what to get a guide cam focused in an OAG, but you'll get 'er done. Me? I used one for years when I was doing film imaging. I'm too lazy to do so now.


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zjc26138
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Re: New Celestron OAG Arrived! new [Re: rmollise]
      #5967684 - 07/12/13 03:41 PM

Oh I know I'll get it to work. Just need patience. My main reason for the OAG? So I can get 3-4 minute subs at 2032mm fl, and so that I don't have to take so many pictures. So I'm lazy as well.

This picture is 97 sub frame, and just over an hour total integration: http://www.astrobin.com/full/47915/?mod=none

While I think its a great image, it would be nice only to have to take 20-15 subs.


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Alfredo Beltran
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Re: New Celestron OAG Arrived! new [Re: zjc26138]
      #5968180 - 07/12/13 10:01 PM

Hi Zach

That's a good image. I have the same camera, unmodified on a C9.25 EdgeHD. I suggest you use a lower ISO and longer exposure times per sub.

How big is the aperture of the OAG when it is attached to the EdgeHD?

Best regards,

Alfredo


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freestar8n
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Re: New Celestron OAG Arrived! new [Re: zjc26138]
      #5968535 - 07/13/13 04:24 AM

The moon is coming back and I recommend getting the OAG and imaging camera co-focused using the moon. In order to see faint guidestars on the guide camera you will need to have it well focused. You should also look in the guide port with your eyeball to make sure there is a clear view of the pupil.

Once it is focused you should be able to find random stars to guide on - and you can practice that way just guiding on a star and not trying to image a particular object. That would get practice with calibrating the guider, and allow you to see first results with OAG - which should be pretty good.

Then I recommend calibrating the OAG so you know how far away the center of the guide chip is from the center of the imaging chip - in arc-minutes. This will let you create a field of view indicator (FOVI) for a planetarium program like TheSky - and let you select an optimal guidestar around an object you want. Then you just need to pre-orient the oag angle so that when the object is centered on the main ccd, the guidestar will fall on the guide ccd.

The one trick to setting the angle is that it is 180 degrees from where it "should" be. If the guidestar is on the north side of the object, then - looking at the back of the 'scope (sct or refractor) with north up - you should have the guide port on the 'down' or south side. This is because the image is inverted.

To do all this more precisely I would make an angle readout on the back.

Much of this is described in a write up I did here.

Some people don't worry about pre-planning a guide star, and they just center the object and then use a very long guide exposure until they see stars to guide on. This may work for you and it would take less effort - but it still requires very good focus on the guider side. I prefer to guide on the brightest guidestar available - and I find that pre-planning one and dialing it in is easy and systematic.

Good luck -
Frank


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zjc26138
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Re: New Celestron OAG Arrived! new [Re: freestar8n]
      #5969341 - 07/13/13 05:26 PM

Alfredo- Thanks! Yeah I plan using ISO800 or ISO1600 with 3-4 minute subs once I get the guiding figured out. How big is the aperture? Do you mean the opening, where the camera attaches? If so the opening is the same size as the t-ring adapter which at measured to be 4.2cm.

Frank- Thanks for all the pointers! How do you calculate the distance between the center of the imaging chip and the center of the guide chip?


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Alfredo Beltran
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Reged: 08/01/10

Loc: Bogota, Colombia
Re: New Celestron OAG Arrived! new [Re: zjc26138]
      #5969391 - 07/13/13 06:03 PM

Quote:

Alfredo- Thanks! Yeah I plan using ISO800 or ISO1600 with 3-4 minute subs once I get the guiding figured out. How big is the aperture? Do you mean the opening, where the camera attaches? If so the opening is the same size as the t-ring adapter which at measured to be 4.2cm.





Hi Zach

That is exactly the size I was asking. If it has the same aperture of the T-adapter then it would cause no different vignetting.

Could you post some pictures of your setup?

Best regards

Alfredo


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zjc26138
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Re: New Celestron OAG Arrived! new [Re: Alfredo Beltran]
      #5969414 - 07/13/13 06:23 PM Attachment (28 downloads)

Alfredo,
Great! I'm glad I answered your question.

Here is a quick picture during daylight testing. The only one I've taken so far. I'll take a couple more tonight once I get everything setup.


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Alfredo Beltran
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Reged: 08/01/10

Loc: Bogota, Colombia
Re: New Celestron OAG Arrived! new [Re: zjc26138]
      #5969505 - 07/13/13 07:27 PM

Hi Zach

Thank you.

It looks very nice! If you can, post one showing the opening.

Seems like a must have accesory. Let us know how the StarShoot Autoguider works with it.

Best regards

Alfredo


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freestar8n
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Re: New Celestron OAG Arrived! new [Re: zjc26138]
      #5969999 - 07/14/13 05:28 AM

There are a number of ways to measure the separation of the guide chip from the imaging chip, and the choice depends on whether or not you have software to plate solve the imaging camera to know its exact center.

The simple way is to orient the guide camera so it is north or south of the imaging camera. Find a bright star and center it on the imaging camera - and note the declination. Then move the scope in dec. until the same star is centered on the guide camera. Make sure you remove any dec. backlash as you do this - and note the change in declination. That is the offset.

If you can plate solve, then just center a known star on the guide chip and then take a few second exposure with the imaging chip. When you plate solve the image it will tell you the exact center of the image, ra/dec, and you can calculate the offset. Again it's best to have the guide camera directly north or south so the only change is in dec.

And note that all this setup stuff and calibration is only needed once per OTA - and after that the OAG usage should be more systematic.

For now the main thing is just to get both things focused accurately - and the moon is good for that since it is big and bright - and at "infinity."

Frank


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jsrj98
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Reged: 02/21/08

Re: New Celestron OAG Arrived! new [Re: freestar8n]
      #5970335 - 07/14/13 12:35 PM

My new OAG is due to arrive tomorrow, so I'm excited to try it. My guiding rig, which worked well for refractors, has proven problematic for my Edge 8 (as I expected).

I currently own a QHY5 (same as Orion SSAG), but I'm worried it won't be sensitive enough. Are there any recommendations on a replacement? I'd love something like the Loadstar or ST-i, but they may be out of my price range at the moment. Does anyone have experience with the QHY5-II L mono-- it has a very high QE?

Thanks, John


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freestar8n
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Re: New Celestron OAG Arrived! new [Re: jsrj98]
      #5971111 - 07/14/13 07:59 PM

Hi-

I just posted a comparison of the QHY5L-ii with Lodestar in the ccd section. Yes, the qhy is very sensitive and works well with OAG - and in my case with MetaGuide.

Frank


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jsrj98
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Reged: 02/21/08

Re: New Celestron OAG Arrived! new [Re: freestar8n]
      #5971369 - 07/14/13 10:50 PM

Thanks, Frank. Very interesting analysis comparing the QHY5L II to the Loadstar. I've always wanted to try MetaGuide but never had a guide camera that could use it. Perhaps this will be my chance.

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jsrj98
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Reged: 02/21/08

Re: New Celestron OAG Arrived! new [Re: jsrj98]
      #5975817 - 07/17/13 11:37 AM

I wanted to report that I was able get my new OAG working last night. It took me quite awhile to figure out the correct spacing for use with my QHY5 guider. I initially used the moon to get the focus close, and then used an open cluster (M39) to fine-tune focus. In the end I needed 21mm of T spacers between the OAG and the guider (with the guider directly screwed onto the OAG). Celestron provides a variety of different spacers included in the package. I followed the instructions and used the ~11mm spacer between the OAG and the T-Ring for my DSLR (their math in the manual does check out in terms of the requirement for 133mm backfocus between OTA and camera for my Edge 8). Luckily had I had on hand a number of other smaller T spacers to to supplement the 6mm they suggest in the manual. It's possible the 24mm they include in the box would come to focus for the guider.

In terms of performance I was able to get just ever so slightly out of round stars at 5 min subs and more oblong stars with 10 min subs. I'm using a Orion Sirius EQ as a mount. I will probably need to check my polar alignment. Also, using PHD with such a long F/L guiding is very new to me, so I will need to do some experimentation on the various settings, I'm sure. My PHD "graph" was all over the place-- but perhaps that's normal? I'm used to using a short F/L guiding setup. However, in the end the FWHM for 5 min and 10 min subs was pretty close to that of a 10 sec sub, so I was pretty happy-- all in the range of the seeing conditions at between 3" and 2.5".


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freestar8n
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Re: New Celestron OAG Arrived! new [Re: jsrj98]
      #5979099 - 07/19/13 02:12 AM

Hi John-

Thanks for the report and I'm glad the OAG is working. It sounds like you were able to find guidestars. If you saw some out of round in 5m and they were more out of round in 10m, that does sound like field rotation and not a guiding issue but you would need to confirm. OAG should provide smaller stars - so other factors like field rotation will be more visible.

As for the "plot" - this alludes to some of the misconceptions about OAG and motivated design aspects of MetaGuide. If you look at the guide error in terms of pixels, it will change dramatically when you change the optics from a small guidescope to oag. An OAG guidestar error plot will look huge and noisy compared to a very quiet guidescope plot - but what really matters is how it looks in terms of arc-seconds. If the centroid is accurate, the plots should be no different when viewed in terms of arc-seconds - and the tuning should be the same also. In MetaGuide all displays and tunings are based on arc-seconds, which I consider the fundamental unit for autoguiding.

Unfortunately when people see this big and noisy oag plot - they think it is *worse* to guide on because it is "guiding on the seeing" or "chasing the seeing" or something. Instead it is providing a more precise measure of the star centroid, when scaled to arc-seconds - and that's a good thing.

I expect this improved guiding will show in your images once you get the polar alignment and other tunings optimized. Then you just need to focus well and you will be limited by seeing rather than guiding and flexure.

Frank


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jsrj98
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Re: New Celestron OAG Arrived! new [Re: freestar8n]
      #5979575 - 07/19/13 10:41 AM

Thanks for your input, Frank. I tweaked the polar alignment a bit and now I'm getting consistently round stars at 5 min. I do understand what you mean about the plot in terms of arc secs. Using my OAG the QHY5 is now guiding at 0.5" per pixel, a huge change from my previous setup-- which was over 6.0"! With that rig, my PHD graphs were always beautifully flat and consistent.

I have to say that I really like the Celestron OAG, as big as it is. It's really robust, and I could see hanging a lot of gear off it. The only conditions under which you might run out of backfocus with it (especially with the larger HD's 9.25 to 14) are if you wanted to add a regular focuser, and fix the primary.

BTW, my new QHY5L II arrives tomorrow so I'm hoping to try MetaGuide very soon. AstroFactors shipped my order the very next day!


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Re: New Celestron OAG Arrived! new [Re: jsrj98]
      #6044944 - 08/25/13 10:40 AM

I have finally had a bit of time to work with my Celestron OAG. Not a lot of time, but enough to say that I'm very happy with the purchase. Last night, for example I was able to take six 480 second exposures with a focal length of 2800mm with perfectly round stars (well not perfect - my collimation and focus left something to be desired, but perfectly guided). Compared to my results using an Orion 400mm guide scope, this is a massive improvement. The only reason I didn't take more and longer exposures was that clouds rolled in and ended the night. Before this OAG I had purchased a Lacerta OAG and while I was able to get good long exposure guiding with that set up, the Celestron OAG is a much more versatile setup. The Celestron allows adjustment of the placement of the guider mirror in 360 degrees around the imaging field of view in addition to modest movement of the guide mirror in and out. It also allows easy rotation of the camera for framing shots. More important, in my opinion, is the helical focuser for the guide camera which makes focusing guide stars infinitely easier than the process for the Lacerta. So far I'm a very happy customer!

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NeoZavier
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Re: New Celestron OAG Arrived! new [Re: end]
      #6061681 - 09/03/13 09:11 PM

Hi to everyone!
Jos to inform I recently bought the OAG from celestron and is amazing! But one horrible problem I found. I own the EdgeHD 8, this error wont happened in the other models of hd. I also bought the reducer for the 8 and the problem is with the back focus. On the 8 with the reducer the back focus is 105mm. The OAG is designed to work on a 133mm back focus that means I can only use it at f/10 so I returned. This wont happened on the other models because the 11hd and 14hd have 146mm of back focus. This is a horrible problem but everyone owning a Edge HD 8 has to know!


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jsrj98
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Re: New Celestron OAG Arrived! new [Re: NeoZavier]
      #6061851 - 09/03/13 10:53 PM

I haven't purchased the new Edge8 FR yet, but when I do, I'm planning to connect it to the scope using this adapter:

http://agenaastro.com/blue-fireball-sct-female-m48-male-thread-adapter-c-04.html

I've done the math and the resulting backfocus will be very close to (+-2mm) the 105mm spec.


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NeoZavier
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Re: New Celestron OAG Arrived! new [Re: jsrj98]
      #6063120 - 09/04/13 05:49 PM

Interesting I would have to see the difference. But still it has to have the male and it has to be short too.And if u use a DSLR it has to sum the distance to the sensor that is 55mm or so. If you are using a CCD you wont have this problem.

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Wmacky
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Re: New Celestron OAG Arrived! new [Re: jsrj98]
      #6315703 - 01/16/14 12:23 AM

Quote:

I haven't purchased the new Edge8 FR yet, but when I do, I'm planning to connect it to the scope using this adapter:

http://agenaastro.com/blue-fireball-sct-female-m48-male-thread-adapter-c-04.html

I've done the math and the resulting backfocus will be very close to (+-2mm) the 105mm spec.




brought this thread back looking for an update:

Has anyone tried this adapter or resolved this issue of the wrong backfocus distance when using this OAG with a reducer on a C8 Edge.

Also, is there a place to install a 2" LPS filter?

Edited by Wmacky (01/17/14 12:48 AM)


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ZR1
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Re: New Celestron OAG Arrived! new [Re: Wmacky]
      #6317050 - 01/16/14 05:47 PM

Is this new adapter for the OAG going to make much of a difference when it is available in April? It looks like it has a larger aperture.

http://www.celestron.com/astronomy/off-axis-guider-adapter.html


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ewave
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Re: New Celestron OAG Arrived! new [Re: ZR1]
      #6317129 - 01/16/14 06:38 PM

Quote:

Is this new adapter for the OAG going to make much of a difference when it is available in April? It looks like it has a larger aperture.

http://www.celestron.com/astronomy/off-axis-guider-adapter.html




I am interested in this item, but cannot find information on the thread specs on either side. It's as if Celestron has this hidden.....


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Peter in Reno
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Re: New Celestron OAG Arrived! new [Re: ewave]
      #6317169 - 01/16/14 06:57 PM

It looks like one side of the new adapter screws into the rear cell of SCT (EdgeHD 9.25 or larger) using larger threads (probably 3.5") instead of much smaller SCT threads.

The other end of the adapter simply connects to the input or telescope side of Celestron latest OAG. This connection uses "dovetail" and is held by three screws of OAG, no threads and still rotatable. All you need to know is the opening or clear aperture of this adapter and it's 62.7mm or 2.47" as stated at the web site. The larger opening allows to fully illuminate the prism of OAG so the guide star can be brighter and easier to find.

The camera side of OAG uses the same supplied camera adapters that already came with OAG. The largest opening is M48 which is just under 2" and big enough for larger format cameras.

Download the OAG manual from Celestron web site. On pages 2, 4 and 5, you will see a picture of "SCT Adapter". This SCT adapter is replaced by the new larger adapter.

Hope this is clear.

Peter


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ewave
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Re: New Celestron OAG Arrived! new [Re: Peter in Reno]
      #6319248 - 01/17/14 06:50 PM

Quote:

It looks like one side of the new adapter screws into the rear cell of SCT (EdgeHD 9.25 or larger) using larger threads (probably 3.5") instead of much smaller SCT threads.

The other end of the adapter simply connects to the input or telescope side of Celestron latest OAG. This connection uses "dovetail" and is held by three screws of OAG, no threads and still rotatable. All you need to know is the opening or clear aperture of this adapter and it's 62.7mm or 2.47" as stated at the web site. The larger opening allows to fully illuminate the prism of OAG so the guide star can be brighter and easier to find.

The camera side of OAG uses the same supplied camera adapters that already came with OAG. The largest opening is M48 which is just under 2" and big enough for larger format cameras.

Download the OAG manual from Celestron web site. On pages 2, 4 and 5, you will see a picture of "SCT Adapter". This SCT adapter is replaced by the new larger adapter.

Hope this is clear.

Peter




Many thanks


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Wmacky
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Re: New Celestron OAG Arrived! new [Re: Wmacky]
      #6319282 - 01/17/14 07:13 PM

Quote:

Quote:

I haven't purchased the new Edge8 FR yet, but when I do, I'm planning to connect it to the scope using this adapter:

http://agenaastro.com/blue-fireball-sct-female-m48-male-thread-adapter-c-04.html

I've done the math and the resulting backfocus will be very close to (+-2mm) the 105mm spec.




brought this thread back looking for an update:

Has anyone tried this adapter or resolved this issue of the wrong backfocus distance when using this OAG with a reducer on a C8 Edge.

Also, is there a place to install a 2" LPS filter?




Anyway......


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Alfredo Beltran
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Re: New Celestron OAG Arrived! new [Re: Wmacky]
      #6319431 - 01/17/14 08:55 PM

Quote:



brought this thread back looking for an update:

Has anyone tried this adapter or resolved this issue of the wrong backfocus distance when using this OAG with a reducer on a C8 Edge.

Also, is there a place to install a 2" LPS filter?




Anyway......




When I bought the C9.25 Edge I chose the adapter manufacturer by Starizona instead of the Celestron because it allows to place 2" filters and except that is exactly the same one as you can see here.

But it would be good to know also if the OAG has an adapter to place the 2" filters after the prism.

Best regards,

Alfredo


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jsrj98
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Re: New Celestron OAG Arrived! new [Re: Wmacky]
      #6321063 - 01/18/14 06:36 PM

I finally purchased the Edge8 0.7x FR to use with the Celestron OAG, and it arrived last week. I THINK my strategy of using the SCT to M48 adapter will work. Unfortunately, after one night of testing I determined that I got a bad FR, and I sent it back to the vendor for a replacement. Using a DSLR, 2/3 of the field was perfectly corrected, with pinpoint stars to the very edge-- from top to bottom. This was using the standard Celestron T-Adapter, so I know the 105mm backfocus was correct, as well as with the OAG. However 1/3 showed oval stars. I sent pics to the vendor and they agreed with my assessment and are sending a new one. Once I receive it and test I will post images.

ETA: I don't think there's a way to use a 2" filter with this combination. Although there might be some creative way to do that.

Edited by jsrj98 (01/18/14 06:40 PM)


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Wmacky
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Re: New Celestron OAG Arrived! new [Re: jsrj98]
      #6321199 - 01/18/14 08:20 PM

Quote:

I finally purchased the Edge8 0.7x FR to use with the Celestron OAG, and it arrived last week. I THINK my strategy of using the SCT to M48 adapter will work. Unfortunately, after one night of testing I determined that I got a bad FR, and I sent it back to the vendor for a replacement. Using a DSLR, 2/3 of the field was perfectly corrected, with pinpoint stars to the very edge-- from top to bottom. This was using the standard Celestron T-Adapter, so I know the 105mm backfocus was correct, as well as with the OAG. However 1/3 showed oval stars. I sent pics to the vendor and they agreed with my assessment and are sending a new one. Once I receive it and test I will post images.

ETA: I don't think there's a way to use a 2" filter with this combination. Although there might be some creative way to do that.




Thanks for the update. Sure seems to be a lot of defective FR for the Edge8! Hmmmmmm. Anyway, that's too bad about the 2" filter. No LPS, and no HA narrowband.


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Thirteen
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Re: New Celestron OAG Arrived! new [Re: jsrj98]
      #6437969 - 03/30/14 03:40 PM

Quote:

I finally purchased the Edge8 0.7x FR to use with the Celestron OAG, and it arrived last week. I THINK my strategy of using the SCT to M48 adapter will work. Unfortunately, after one night of testing I determined that I got a bad FR, and I sent it back to the vendor for a replacement. Using a DSLR, 2/3 of the field was perfectly corrected, with pinpoint stars to the very edge-- from top to bottom. This was using the standard Celestron T-Adapter, so I know the 105mm backfocus was correct, as well as with the OAG. However 1/3 showed oval stars. I sent pics to the vendor and they agreed with my assessment and are sending a new one. Once I receive it and test I will post images.

ETA: I don't think there's a way to use a 2" filter with this combination. Although there might be some creative way to do that.




Thread resurrection!

I've been shopping around and really feel this setup would be the best way to use an OAG and the edge .7 FR. It's been a few months, do you have an update on it? I haven't purchased either yet. As far as I can tell, a lot of these Celestron Focal reducers get sent back. I am really considering pairing the Lepus HD telecompressor. With adapters it may cost more, but us Edge 8" owners need something that works. It's not like we are trying to do something extraordinary.


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