CLS filter effect on exposure length
Posted 19 April 2013 - 09:41 PM
Posted 19 April 2013 - 10:01 PM
Posted 20 April 2013 - 06:59 PM
You want to expose as long as you can (and tracking/guiding allows), while keeping the histogram away from both edges.
Posted 20 April 2013 - 07:19 PM
Posted 20 April 2013 - 07:50 PM
Posted 21 April 2013 - 09:59 AM
Posted 22 April 2013 - 06:47 PM
The color balance is touchier but can be alleviated by using custom white balance or PS trickery. Secondary reflections can be a problem but steps can be taken to minimize them too.
Posted 23 April 2013 - 12:43 PM
When using an Astronomik CLS CCD filter (passes 95% of various important light), am I really only hurting my exposure length compared to non filter use by 5%?
The better question is - how does the exposure length compare to not using one? I live in a white zone, Bortle scale 8-9, and I'm able to take 3 minute subs using my Astronomik clip-in filter in my Canon. My exposure time right now is limited by lack of guiding and accuracy of polar alignment. This would be impossible without it. I probably couldn't get longer than 30 seconds without any filter.
Posted 23 April 2013 - 01:45 PM