Quote:
Originally Posted by mldee
I presume the exposures were done with a constant value of illumination from your light box, so with that fixed level of light, anything beyond about 7 seconds will start to cause white compression? How does this affect your choice of flats exposure time, and in your opinion, how does it relate to other amounts of light (eg; night sky objects as we see them?)
What gain and offset do you use on the QHY8Pro?
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Mike,
Yes - I used the light box with the brightness constant throughout. I'm unsure what is the best time to choose based on what people have said - somewhere between "1/3 of full well" to "as high as possible on the linear part of the curve". 7-9 seconds seems to be the point where the curve turns so I guess I should be shooting flats at between 2 and 7 seconds. Not sure how to compare the light box to night sky - I guess you could do a similar thing if you were quick! I use gain=0 and offset=125.
Peter