Thanks for the reply.
If I check my RGB subs for a clear night in PI with settings for 12bit to match the camera, the k value is between 60 to 100 for the background to over 4000 for the bright stars. It would seem I need to double my exposure to get the 400 expected value. Or do I have the units or bit depth wrong?
Quote:
Originally Posted by Atmos
Good threaded connections shouldn't introduce tilt but as Joshua suggests, images of your components at the moment can be good way of seeing where the weak point is.
Also, does the tilt change as you move from east to west or north to south?
As for every filter having a different background brightness, that's completely normal. Different moisture contents in the air change how bright the sky can be. It's easiest to just pick an exposure that is suitable for the best of nights (moonless and good transparency) and just use that exposure. You'll waste more time trying to get the perfect exposure for each filter every night for next to no gain in image quality.
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