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First Light for Edge 8''

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#26 Footbag

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Posted 06 March 2013 - 12:45 PM

How do you guide at F10? I'm hoping that my guiding rig will work at 1400mm-- I just assumed it wouldn't at 2000mm-- so I haven't given it a shot yet. My rig is a QHY5 with a small scope (50mm) held by beefy ADM rings attached to a dovetail bar on top of the Edge8. In the back of my mind I have the feeling I'll have to go the OAG route. I did purchase a FeatherTouch micro focuser for scope and it work beautifully.


With my WO66/SSAG, I've been able to guide my Edge HD 800 up to 8m. After that, there is some drift that becomes too much. I believe it is flexure from either my mounting or focuser. I have heard of people guiding at 5:1 with the Orion 50mm package, but I don't know about at 2032mm. Based on my experiences, I was surprised that people were able to get good exposures when pushing the 5:1. I hate being right at the maximum, and the F10 will be well over.

Last night I finally got my OAG working. This is after much struggle, but now I'm reasdy for the big league. I cannot wait until I get to image with it for the first time.

#27 zjc26138

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Posted 06 March 2013 - 01:37 PM

Adam- Thanks for your input. I still deciding between a small scope or an OAG for guiding. Though I'm leaning more toward the OAG. Currently it seems like a better route to take. I would try to guide with my SV 80/9D atop of the Edge, but I'm pretty sure that's way to long of a scope to be mounted on top of the Edge.

#28 John Miele

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Posted 06 March 2013 - 02:19 PM

I'm about to try guiding my Edge 8 @ f/10 with a ST-80 and a QHY5-II guider. I tried a couple nights ago but had a problem with conecting to my mount. But I think I have that fixed and will try again tomorrow as it should be a clear night. My ST-80 is mounted with ADM rings and dovetail. I hope it will be sturdy enough to prevent detrimental flex! Of course, I'll also lock the mirror down while guiding...John

#29 zjc26138

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Posted 06 March 2013 - 03:07 PM

John- Hopefully you will have success guiding! My SV 80/9D is a wonderful guide scope when I use it with my TMB. But I think at 30 inches long, it might to long for the Edge. Though I could always give it a try.

#30 Patrick

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Posted 06 March 2013 - 06:47 PM

I find it interesting how many new EdgeHD owners are out there as I'm one of them, too... :)

I purchased mine in December and have yet to take the first image through it for one reason or another. Right now it's just the weather.

I have my AT66ED sitting on the C8HD with an ADM MDS dovetail bar and ADM rings. I think guiding the C8HD at f/10 through the 400mm refractor will be okay with my DSLR and short exposures. I also have the focal reducer on back order at Adorama...it sure would be nice if Celestron would release those soon. :(

I'm looking forward to imaging with the scope. It's a great scope to look through, too! I need to pick up some kind of grab and go alt/az mount for it. :smirk:

Patrick

#31 zjc26138

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Posted 06 March 2013 - 06:53 PM

Yeah there are a surprising number of EdgeHD owners. More than I thought. I plan on getting the focal reducer eventually, but for now I'm going to see how well I can image at f/10.

I have Universal Astronomics Macrostar Delux on a surveyors tripod. I really like this mount and can use it will all the scopes I currently have. I had the 8" HD on there the other day and the mount handled it well. I didn't get to test it under the stars, but I see no reason for the mount now to perform well. :)

#32 ensign

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Posted 06 March 2013 - 07:27 PM

Good read. Thanks for the write up. I'm looking to purchase an EdgeHD 9.25 soon hopefully.


I got a 9.25 Edge OTA last summer strictly for visual. It won't disappoint.

#33 John Miele

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Posted 06 March 2013 - 08:59 PM

John- Hopefully you will have success guiding! My SV 80/9D is a wonderful guide scope when I use it with my TMB. But I think at 30 inches long, it might to long for the Edge. Though I could always give it a try.


Here is the setup I'll be using. It's on a Losmandy G11 mount...John

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#34 zjc26138

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Posted 06 March 2013 - 11:34 PM

Beautiful setup John. I'm using an IOptron iEQ45 with my Edge. Here's a picture from the first light night, after I stopped imaging. I really need a dew shield, luckily it will be here tomorrow.

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#35 landshark99

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Posted 07 March 2013 - 01:08 AM

here is my recently bought 8"Edge on a AVX mount, although I have now gone to a 2" diagonal since I took this pic
Posted Image

#36 zjc26138

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Posted 07 March 2013 - 01:45 PM

Looks like you forgot to attach the picture. :grin:

#37 zawijava

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Posted 07 March 2013 - 02:13 PM

It must be VERY DARK where you are...I don't see it :grin:

here is my recently bought 8"Edge on a AVX mount



#38 landshark99

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Posted 07 March 2013 - 02:42 PM

strange it was there when I posted, just edited and reloaded the image

#39 zjc26138

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Posted 07 March 2013 - 02:53 PM

Great looking setup! I've heard a lot of good things about the AVX mount.

#40 my_universe

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Posted 07 March 2013 - 02:59 PM

Here is the setup I'll be using. It's on a Losmandy G11 mount...John


John, how is your guide scope mounting plate attached to the OTA? I need to get something similar for mine.

Thanks,
Steve

#41 John Miele

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Posted 07 March 2013 - 03:13 PM

Hi Steve,

The scope and rings (ADM) are attached to an ADM V (Vixen style) series attachment bar that uses radius blocks to pick up existing holes in the Edge front and rear castings. The part number is VC8 on the ADM website. It is made to fit the Celestron C8 scopes and comes with the radius blocks and mounting screws. I love the ADM hardware. It is solid and beautifully machined stuff...John

#42 zjc26138

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Posted 07 March 2013 - 07:48 PM

I almost have the scope balanced in the DEC. I have a 5in bolt on the end of the dovetail with 2.8 lbs of washers. With this weight, plus the weight of the dew sheild I'm balanced with my 2in diagonal. I still need a little more weight to balance once the camera is attached to the scope. I don't have any room left on the bolt for more washers. I'll either have to get a 5.5in bolt or get heavy washers. At least I'm getting close. :)

#43 my_universe

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Posted 08 March 2013 - 12:33 PM

Hi Steve,

The scope and rings (ADM) are attached to an ADM V (Vixen style) series attachment bar that uses radius blocks to pick up existing holes in the Edge front and rear castings. The part number is VC8 on the ADM website. It is made to fit the Celestron C8 scopes and comes with the radius blocks and mounting screws. I love the ADM hardware. It is solid and beautifully machined stuff...John


Thanks very much, John. Indeed, ADM makes nice stuff.

Steve

#44 zjc26138

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Posted 09 March 2013 - 10:02 AM

Another great night with the Edge. I really love this scope. I've never seen so much detail on Jupiter. It looked amazing. The Orion Nebla looked wonderful as well. I also looked at M67, M68, M81, and M82. All looked nice, even in my light polluted skies. I really need to get this scope under darker skies.

The only issue of the night was dew. Even with a dew shield the corrector started to dew around 12:30 AM. The scope had been outside for well over 4 hours at this point. I guess I'll need to buy some dew straps. However in the mean time is a hair dryer enough to keep the dew away? Will it hurt the corrector to blow some warm air over it to prevent the dew from forming?

#45 John Miele

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Posted 09 March 2013 - 12:59 PM

Zach,

Here is what I got last night on M51. This is a stack of 15 x 3minute subs. Guding was a BEAR! It is very difficult to guide at 2032mm focal length. I was able to get really round stars at 2 minute subs, at 3 minutes they were starting to trail just a bit, and 5 minute subs were not acceptable. I don't know if I had some flexure, or I just need to tweak PHD settings better. I could not get the RMS value in PHD to get below .25 and the OSC index was always low. 5 minutes is my goal for guiding. I will try some more. This was a fast processing job with a few darks but no flats. Anyway, it's just an example shot and I have a ways to go. But this longer focal length really gets in close and I like that!...John

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#46 zjc26138

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Posted 09 March 2013 - 01:34 PM

John,
That's a great image. I do like how the longer focal length gets you a zoomed in image. I'm hoping once I get an OAG I can get 2-3 minute subs.

This image of M42 was comprised of 55, 20 second subs at ISO3200. I had a couple good unguided subs at 45 seconds, but I figured I better stay with shorter subs since the keeper rate was 92%.

#47 Eddgie

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Posted 09 March 2013 - 09:15 PM

When I tell people on the refractor forum that the EdgeHD 8" is on par with my 6" APO for field sharpness, I think they believe I am overstating the situation.

As you appear to be learning, the EdgeHD 8" is a remarkable little telescope.

#48 zjc26138

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Posted 09 March 2013 - 11:15 PM

When I tell people on the refractor forum that the EdgeHD 8" is on par with my 6" APO for field sharpness, I think they believe I am overstating the situation.

As you appear to be learning, the EdgeHD 8" is a remarkable little telescope.


It really is. It's a hidden gem. I love it.

#49 wky46

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Posted 09 March 2013 - 11:38 PM

Awesome Zach! I think if I ever get another telescope, it will have to be an Edge. Yep, sounds like time for a heater strip. Blow driers are a hassle and it really is better to be proactive when it comes to moisture on the lens :).....Phil

#50 zjc26138

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Posted 10 March 2013 - 10:38 AM

Phil- Yeah I imagine the dew heater strip is the better way to go, though in the mean time the hair dryer will have to do. :)






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