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GSP RC6 Star Issue

astrophotography collimation dslr equipment imaging mirror making optics reflector
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#1 Jhillphotos

Jhillphotos

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Posted 12 June 2019 - 11:15 PM

Hello!

 

So, I recently received the GSO RC6 that I purchased and decided to take it out to my front yard to do some test shots. Upon loading the images onto my computer the next morning, I saw a few interesting things happening that I am not sure how to identify. I saw field curvature like behavior (streaked stars) in the top left and right corners (as well as some artifacts coming off bright stars). I also saw what looked like out of focus stars in the bottom left, and the bottom right was nearly perfect. After re-collimating the telescope myself two nights later, I found that the exact same issue was happening, just slightly less. 

 

Does anyone know what this could be and how it could be fixed? (preferably not a field flattener or focal reducer – I am on a tight budget lol)

I have attached single image frames of the problem on M13 and the Trifid Nebula. 

 

I also talked to someone at Agena AstroProducts who gave me some great insight but said that it couldn't be the optics and that it must have something to do with my camera or focuser not being aligned properly. Even after carefully triple checking that my camera and guide scope/its camera were all aligned properly and securely, the issue still appeared. I would really appreciate some help as I don't want to have to return it and go telescope hunting again tongue2.gif

 

https://flic.kr/p/2gdijEc

 

https://flic.kr/p/2gdi6wu

 

Also, I am using a Nikon D5500 with a T ring and the 1.25" adapter with a Baader moon and skyglow filter attached to it.

Here are the two full versions of the images above. I would post the version I stacked in pixinsight, but my polar alignment was off so there was some image shift over the night and stacking it made the corners go crazy hahaha (so it is probably not accurate to the issue).

 

https://flic.kr/p/2gduJu9

 

https://flic.kr/p/2gdugao


Edited by Jhillphotos, 13 June 2019 - 08:47 AM.



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