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Stray light in image train

Beginner Astrophotography Equipment Imaging Reflector
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#1 unbreakable goose

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Posted 27 October 2021 - 04:01 AM

Hi all, 
 
I recently upgraded to a new scope and reducer combo. Whenever I image near a bright object, I get some 'stray light' in the image. I have attached a photo of Venus to show what I mean (I admit, it's overexposed but I wanted to emphasize the issue). I also included a photo of a galaxy, the outer ring of the galaxy is this same light effect. 
 
Photo of Venus: https://drive.google...ew?usp=drivesdk
 
Photo of galaxy: https://drive.google...ew?usp=drivesdk
 
 
 
What is causing this and how can I fix it?
 
I don't think it could be the back focal distance of the reducer, since I can get perfect focus. That being said, I'm very new to this 
 
My equipment 
GSO RC 8" f/8 
Gso 0.75x reducer (designed for this scope)
Zwo filter wheel
Zwo Asi183mm pro cool camera 
 
 
Thanks in advance for any help
Clear skies!

#2 Medic002

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Posted 27 October 2021 - 05:49 AM

were u taking these pics close to the moon or have a street light or something in the area? You can try using a dew shield attached to front of scope if that is from a street light or scope pointed near the moon.


Edited by Medic002, 27 October 2021 - 05:51 AM.

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#3 unbreakable goose

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Posted 27 October 2021 - 05:58 AM

were u taking these pics close to the moon or have a street light or something in the area? You can try using a dew shield attached to front of scope if that is from a street light or scope pointed near the moon.


Those images were taken with no moon or streetlight. The stray light in the images are from the target in the photo only. I think there might be some internal reflections happening, but Im not sure how to fix it

#4 Medic002

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Posted 27 October 2021 - 02:09 PM

Could be a collimation issue causing reflections of mirrors not being aligned properly.


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#5 unbreakable goose

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Posted 27 October 2021 - 10:06 PM

Could be a collimation issue causing reflections of mirrors not being aligned properly.


Good idea! Thanks!


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