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I've been having problems with flats. It's not a big problem yet because I have yet to capture lights of a quality that would really benefit from good flats. I seem to be trying to learn all phases of astrophotography at once. My problem with my flats is that I don't seem to be capturing them bright enough. I use a home made light box that has 37 LEDs built into a cylinder that inserts into the dew shield of my TEC 140, so the luminance of the source is not at issue. A friend of mine who is a very smart accomplished imager and processor has used some software that he has and found my flats not bright enough. He says, and I agree because I read the book he learned it from, that flats should be about 50% of the full well capacity of the camera sensor. My flats have been about 33%.
The last time I imaged I took 3 sets of flats; one set using AV flat mode, one set at 1/125 second, and one set at 1/100 second. None of them were bright enough.
I complicate the situation by using an Astronomik CLS clip in filter which skews my RGB histogram with a wide spread between green at the left, red in the middle, and blue at the right. I thought I was compensating by using the Luminance histogram and getting it plus and minus center with the 1/125 and 1/100 second. Still I ended up not bright enough.
Is there a tool in BYE that I have not found yet to get the right setting? Does anyone have any advice to help me get repeatably correct ADU values for my flats?
Thanks in advance for any advice.
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