Quote:
Originally Posted by Octane
Hi Trevor,
No problem.
One more thing, make sure you're shooting at ISO-100, it's very easy to forget that you were imaging at ISO-400, or what have you, and then go and take flats at the same ISO. 
Regards,
Humayun |
Hi Humayun,
Just wondering, if I take my lights, darks and bias frames at ISO 800 why should my flats be taken at ISO 100.
I read your message just before I went down to my observatory last night, so I took two sets of flats one at ISO 800 at 1/200 th sec and one set at ISO 100 at 1/30 th sec. Both exposure and ISO combinations got my histogram about 2/3 across the graph.
The image from last night that I have posted was calibrated with the ISO 800 flats and I am currently re processing with the ISO 100 flats for comparison.
I know nothing about this subject and just wondered at the reason for using ISO 100 for flats.
Regards
Trevor