I captured the two images below last night in decent skies...at least given the LP of my suburban Boston location.
I'm hoping some of the experienced and expert nebula imagers out there can help steer me back on course relative to getting the nebulas visible and color-correct while observing with Sharpcap 3.2 Pro. I thought perhaps comments specific to the two types of problems I'm experiencing might be a reasonable way to get to the issues and help me improve my knowledge and ability to see and enjoy these beautiful and interesting objects.
1. The first image shows a vignetted view with the East Veil Nebula (the Fish-hook) faintly visible in the upper right. I had to over-expose this to even see the nebula shape. Obviously the color is wrong. Given my current scope and cameras, is there a way for me to eliminate the vignetting and bring out the nebulas and their honest colors?
2. The second image shows the same general view a bit later on (132, 15 second frames versus 28 in the first image). Here the vignetting is gone and the nebula is faintly visible but largely over-whelmed with stars and with a general reddish glow to the lower left which does not quite look like a vignette. I was not able to eliminate the glow or get the nebula to stand out in a normal way against the stars.
Although I own what I thought was a reasonable nebula filter, I'm not using it since it turns out it's for visual observing and I just learned that, for imaging you don't use filters intended for visual - an expensive learning experience. But, I've recall seeing numerous lovely nebula captures posted here in CN that specifically mentioned that no filters were used - I'm a bit puzzled and would really appreciate some help.
thanks very much for any/all input on the above problems and any other aspect of imaging !
Image 1: NGC 6995 Eastern Veil Nebula - Vignetted:
Raw16/Bin1/Exp15 sec/Gain 340/Frames 28/Brightness 7/Total 420 secs /Darks no Flats
Image 2: NGC 6995 Eastern Veil Nebula - Overwhelmed by Stars & Non-nebular glow
Raw16/Bin1/Exp 15 sec/Gain 299/Frames 132/Brightness 10/Total 1980 secs /Darks no Flats