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ORION NEBULA_(2) 01-19-2015
Single 320 sec Exp. It seems that if I move the target away from the reflection the reflection goes away. In this case the star on the right was causing the reflection. When I moved the star on the right into the field of view the refection was gone all together. I need to do a bit more testing and then hopefully be able to do some proper imaging.
Comment
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Comment by Russ Ruggles on January 22, 2015 at 10:30am
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The reflections rotating with the camera narrows the problem down a lot. It's the camera, filter attached to the camera or what ever is in the optical train that rotated. Could be a reflection inside the extension tube.
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Comment by Philip A Cruden on January 22, 2015 at 8:55am
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Thanks Russ, I will get it nailed down at some point. I did try rotating the camera and the reflections rotated with the camera. I did use my dew shield and my backyard is pretty dark but having said that I was shooting south towards Phoenix light pollution. If the wind dies I will try again tonight and see if I can get it sorted. I may wait until midnight when Orion is more west where there is less light pollution. Thanks for the tips. Cheers, Phil
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Reflection can be caused by many things. the inside of the OTA, the optics themselves, any filters (light pollution) and so on. Assuming you're using a nice dark dew shield to block local stray light it could be any of the above. SCTs are notorious for bright star reflection. Sometimes it's as simple as rotating your camera... who knows. Try anything and everything.
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