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Equipment Discussions >> Mounts

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Alfredo Beltran
sage


Reged: 08/01/10

Loc: Bogota, Colombia
iEQ45 PE reduced to 4.5 arcsec peak to peak!!
      #5699059 - 02/24/13 10:45 PM

Hi everyone

After looking at other users results in which the PE of iEQ45 mounts has been taken to +/-2 arcsec, I decided to try with mine. Those results have been published in the iEQ45 imaging yahoo group.

My mount is an iEQ45 of the first batches with 8406 hand control. I used a trial version of Pempro to measure the Periodic Error (PE) of the mount and found it was 14.38 arc-secs: http://flic.kr/p/dXEmxd . Better than expected.

Data was aquired through a Celestron C6 SCT with an Orion StarShoot Autoguider and a Celestron f6.3 focal reducer. Pixel Scale was 0.95" per pixel, which implies the telescope was at f7.5 (1130 mm).

After training the Periodic Error Correction (PEC) on the mount, I got a peak to peak PE of just 4.59 arc-secs: http://flic.kr/p/dXyEEX

This is a very satisfying result which speaks very well about this mount!

Best regards

Alfredo


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lambermo
professor emeritus


Reged: 07/16/07

Loc: .nl
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Alfredo Beltran]
      #5699262 - 02/25/13 02:56 AM

Thanks for posting this info, I've added it to my mounts list .

-- Hans


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Alfredo Beltran
sage


Reged: 08/01/10

Loc: Bogota, Colombia
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: lambermo]
      #5699381 - 02/25/13 07:52 AM

Hi Hans

These results show than in fact the iEQ45 performs very well when compared to other mounts in its class.

I must clarify that in no way I'm related to iOptron. I'm just a satisfied costumer.

You have very valuable information in that list. A good guide about mounts performance.

Best regards

Alfredo


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timmbottoni
Carpal Tunnel


Reged: 08/25/05

Loc: W Chicago suburbs, IL USA
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Alfredo Beltran]
      #5699545 - 02/25/13 10:04 AM

I'm becoming more and more interested in this mount, since I'm looking at getting started in Astrophotography. I think I will also join the Yahoo group mentioned.

Thanks!

Timm


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zjc26138
Loved By All
*****

Reged: 02/24/05

Loc: Mingo Junction, Ohio
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: timmbottoni]
      #5700104 - 02/25/13 03:47 PM

Thanks for posting the info.

I think I'm going to run PemPro tonight on my mount. Quick question though. In the setup for the mount it asks you how many teeth are in the worm gear. I found the number 216 on iOptron's website for mount specs. Is this the correct number of teeth?


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Alfredo Beltran
sage


Reged: 08/01/10

Loc: Bogota, Colombia
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: zjc26138]
      #5700274 - 02/25/13 05:25 PM

Yes, that's the correct number of teeth

Best regards

Alfredo


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zjc26138
Loved By All
*****

Reged: 02/24/05

Loc: Mingo Junction, Ohio
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Alfredo Beltran]
      #5700299 - 02/25/13 05:45 PM

Quote:

Yes, that's the correct number of teeth

Best regards

Alfredo




Alfredo,
Thanks for the info!


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Alfredo Beltran
sage


Reged: 08/01/10

Loc: Bogota, Colombia
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: zjc26138]
      #5700356 - 02/25/13 06:22 PM

You're welcome.

Keep us posted about your results.

By the way what's your name?

Best regards

Alfredo


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zjc26138
Loved By All
*****

Reged: 02/24/05

Loc: Mingo Junction, Ohio
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Alfredo Beltran]
      #5700382 - 02/25/13 06:38 PM

My name is Zach. Will do, hopefully I can get some results tonight

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Astronewb
Pooh-Bah
*****

Reged: 09/19/11

Loc: Connecticut
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: zjc26138]
      #5700747 - 02/25/13 11:00 PM

It might be helpful at this point to mention that PEC will not work with the iEQ45 with the 8407 handcontroller when autoguiding. The mount will turn off PEC by default in that situation.

You may still be able to do it by using Ascom thru the RS232 port to guide instead of the ST4 port?

Cheers,

Paul


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zjc26138
Loved By All
*****

Reged: 02/24/05

Loc: Mingo Junction, Ohio
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Astronewb]
      #5700765 - 02/25/13 11:13 PM

I couldn't get PEMpro to work. I have the older controller. I was using my guide camera to try to get it work, an Orion SSAG.Which is plugged into the the ST4 port and then USB'd into my computer. It was not recognizing the mount. Should I have had the RS232 cable plugged from the mount into the computer as well or is that guide scope setup enough? Also what other software do I need for PEMpro to work? Thanks!

Edited by zjc26138 (02/25/13 11:14 PM)


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Alfredo Beltran
sage


Reged: 08/01/10

Loc: Bogota, Colombia
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Astronewb]
      #5701084 - 02/26/13 07:23 AM

Hi Paul

Since I own the 8406 HC and not the 8407, I couldn't tell. Nevertheless that has been said in the iEQ45 imaging Yahoo User Group and yes, you can guide through the serial port with PEC on.

I think with 8406 you can guide with PEC on through the standard ST4 port. I can check that next time I am under the stars

Best regards

Alfredo


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Alfredo Beltran
sage


Reged: 08/01/10

Loc: Bogota, Colombia
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: zjc26138]
      #5701106 - 02/26/13 07:40 AM

Quote:

I couldn't get PEMpro to work. I have the older controller. I was using my guide camera to try to get it work, an Orion SSAG.Which is plugged into the the ST4 port and then USB'd into my computer. It was not recognizing the mount. Should I have had the RS232 cable plugged from the mount into the computer as well or is that guide scope setup enough? Also what other software do I need for PEMpro to work? Thanks!




Hi Zach

I also have the "older" 8406 controller and this seems to be an advantage because it would let you guide through ST4 port with PEC on.

To make Pempro work, you need to use the SSAG as your main camera in Maxim (check Pempro's help because I think other software also will work). Then you run the tutorials to configure everything. I may be wrong, but you can't connect the SSAG to the ST4 port for this process.

There are some settings you need to configure. See here

Best regards

Alfredo


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zjc26138
Loved By All
*****

Reged: 02/24/05

Loc: Mingo Junction, Ohio
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Alfredo Beltran]
      #5701171 - 02/26/13 08:43 AM

Alfredo,
Thanks for the help again. I'll try it today and see if I can PEMPro to work. It's going to be raining/snowing the next few days so I went be able to test under the skies until then.

Thanks,
Zach


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Astronewb
Pooh-Bah
*****

Reged: 09/19/11

Loc: Connecticut
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: zjc26138]
      #5701812 - 02/26/13 02:43 PM

Quote:

I think with 8406 you can guide with PEC on through the standard ST4 port. I can check that next time I am under the stars




Thank you Alfredo,

Just an update for 8407HC users, iOptron has informed me that PEC will indeed work in conjunction with ST4 autoguiding...?

“The autoguiding will work as long as the mount is in tracking. If the PEC is ON, they will work together. The PEC playback period is 0.1 second. If autoguiding period is greater than 0.1 second, the PEC will play the main role.”

I had a little concern about the 'as long as the mount is tracking' statement. Does that mean just visually tracking an object?

And, if the PEC playback is .10 sec..then you would have to have your PHD exposures at .05 seconds, to enable PHD to send guide commands..and that won't work at that short exposure unless you're guide star is Sirius or another very bright star.

So, next opportunity I have with the iEQ45, I'm going to try and record PEC and initiate playback, with, and without guiding enabled, just to see what's going on.

If any other 8407HC users have successfully used PEC in tandem with ST4 port guiding, I'd love to hear about it.

Cheers all,

Paul


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Phillip Easton
sage


Reged: 12/24/10

Loc: DFW
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Astronewb]
      #5702186 - 02/26/13 06:06 PM

Gratz again Alfredo on the good results!

Paul,

Wow that opens up a lot more questions??!! LOL Good to know the PEC period though. Since it's that short more reason to collect a lot of curves and average them in PEMPro.

Cheers!


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Alfredo Beltran
sage


Reged: 08/01/10

Loc: Bogota, Colombia
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Phillip Easton]
      #5703461 - 02/27/13 12:45 PM

Thanks for your comments Phillip.

I'm very happy with my mount, as well as others who have gotten similar results

Best regards

Alfredo


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Kendahl
member


Reged: 02/02/13

Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Alfredo Beltran]
      #5704381 - 02/27/13 10:09 PM

I have been following comments about the iEQ45 for several weeks on Yahoo's ieq45imaging group and on here.

On paper, the iEQ45 looks very promising. Load capacity is enough for a 9.25" SCT which is the heaviest telescope I will ever want to handle. Price is moderate. Weight, which is my major concern, is substantially less than an Atlas or CGEM. However, I have been discouraged by comments about uncorrectible tracking errors that would make the mount useless at focal lengths greater than a few hundred millimeters. At this point, I can't decide whether to buy an iEQ45 as my permanent imaging mount or to start out with something cheap, like a CG-5, to learn with, and make the big financial jump to the likes of an Astrophysics Mach1 later on.

I would like to propose the following test of an iEQ45's tracking accuracy. Track on and photograph a bright star such as Sirius. Use a long focal length to magnify the results of tracking errors. An SCT with a Barlow instead of a reducer would be a good choice. Make repeated images, as quickly as possible, for at least one full worm period. It may be possible treat the star like a planet and run a DSLR in video mode. Perform the test with all four combinations of PEC on and off and autoguiding on and off. Examine the images and graph the movement of the target star over time.

With autoguiding off, I would expect to see the results Alfredo got superimposed on a steady drift due to residual errors in polar alignment. With autoguiding on, I would expect to see the drift eliminated and hope to see the remaining PE substantially reduced. What are of most interest are tracking errors that autoguiding, with or without PEC, cannot correct. They are what determines the longest focal length at which one can still get good images. I have read comments that a Mach1 has a PE of 0.5 arc-seconds out of the box. This is impressive but irrelevant if one can do as well autoguiding an iEQ45.


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Bluejay08
member


Reged: 09/29/09

Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Kendahl]
      #5704416 - 02/27/13 10:20 PM

well, Luke Jones had already posted a message to correct his claim of uncorrectable tracking errors at long focal lengths. Here is the link:
http://tech.groups.yahoo.com/group/ieq45imaging/message/1904

Hope this clears your concerns.

Jay


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timmbottoni
Carpal Tunnel


Reged: 08/25/05

Loc: W Chicago suburbs, IL USA
Re: iEQ45 PE reduced to 4.5 arcsec peak to peak!! new [Re: Bluejay08]
      #5704471 - 02/27/13 10:49 PM

Thanks for all the info in this post! I'm eagerly following the iEQ45 as a possible AP capable mount for me to start with

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