Doug,
Thanks for the link to the thread on Flats. I'm looking for a bit of clarification on the measurements referred to in the thread. Are people referring to the mean or maximum pixel value? Ie you suggest 22k ADU - is this the maximum or mean pixel value in the flat? What software are you using to measure this? Nebulosity has a pixel stats window that gives min, mean and maximum pixel values - will this work?
Did you end up plotting the exposure vs pixel value curve for the QHY8pro? Mine still looks pretty linear up to 26180 maximum pixel value - might have to try some longer exposures.
Peter
Quote:
Originally Posted by Hagar
I would think it is a problem with your flats as I have had similar and found flats captured with an average of 23000 produced the best results for me. They have to be the hardest thing to get correct and all you can do is experiment. I actually sat one night and captured 10 different sets of flats after an imaging run one night and just processed the image 10 times then used the set which came out the best. Took a while but it did give me somewhere to start next time and I found they ended up being my flats setting for all future images with my QHY8 and Pro.
This is the post and comments made at the time: http://www.iceinspace.com.au/forum/s...ad.php?t=56267 |