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Auto Guide Questions Celestron VX

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#1 mdmyer

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Posted 12 July 2018 - 07:56 PM

I am an advanced amateur astronomer, and kind of an advanced photographer too. I have a 20" Starmaster dob telescope with GO TO and tracking, so I understand star alignment and go to. In the past I have done prime focus photography though a 10" F 4.5 and a 16" f 4.5 on large German Equatorial mounts, but I manually guided those exposures, and they were with film cameras. I have done some wide field piggy back photography with a Canon 5D Mark III using a 14mm F 2.8, a 24-70 F 2.8, and a 70-200 f 2.8 I use an Ioptron Sky Tracker Pro and it works well. But I also have a 300mm F 2.8 that I want to shoot with, wide field astrophotography. And I doubt the Sky Tracker will carry the 300mm and the 5D Mark III. So I have been looking at the Celestron Advanced VX. And I have been looking at auto guiding. That is where my questions will be. I am considering shooting with the 300mm and an old Celestron C-90 setting side by side on the VX and using the C-90 as a guide scope. Will a lap top be needed to guide the VX in this set up? At this point I don't feel a need to have a lap top in the field with me. But I do like the idea of auto guiding the 300mm. Will the VX auto guide using a C-90 as a guide scope, the C-90 does have an 1 1/4" star diagonal in it. If the C-90 won't work I am sure I can pick up something that will work as a guide scope. What auto guiding eyepieces or cameras do you have?Thanks for your help.



#2 Jim Davis

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Posted 12 July 2018 - 08:05 PM

Autoguiders are normally controlled by a computer. There are a few that have it built in, like the Celestron NexGuide Autoguider.  You could use the C-90. I have never tried the all in one autoguider. I would suspect getting them in focus is a challenge.

 

https://www.celestro...uide-autoguider.



#3 zxx

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Posted 12 July 2018 - 09:23 PM

At 300mm FL the AVX should give you 1min exposures unguided with a good PA ,A 50mm guide scope may work better for guiding

I could get 1min exposures unguided with my CG-4 mount at 600MM FL 


Edited by zxx, 12 July 2018 - 09:37 PM.


#4 mdmyer

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Posted 13 July 2018 - 05:36 PM

Thank you for your advice. The Celestron dedicated auto guider looks like something I could use, but it is on back order. I am checking with Celestron to see when they expect have to more in stock. Are there any other auto guiders that I could consider? Again, I am mostly looking for just a guider, and not anything that would require a lap top. I did ask Celestron if focusing was done on the screen on the guider, they have not replied yet. Thanks again. 




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