@cbphoto wrote:
Observe that the image histogram spike is very close to the left, while the
L value showed very large number, indicating that the pixel is almost white.Why is this?? Did I do something wrong?
I was relying on the histogram to give me proper exposure for flats, I think I have overexposed the flat?
Camera setting used: QHY163M Gain 20, Offset 100, 5 second exposure
Filter used with the flat frame: 8.5nm OIII filter
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