Quote:
Originally Posted by multiweb
We spend hours and nights capturing light frames and to get the best results you need to calibrate properly otherwise you might as well dump the lot. A fresh set of flats takes minutes. So I just do them with an EL panel. I understand about keeping optics/filters clean, etc... In real life it never happens. There is uneven illumination, dust motes on filters, on correctors, on lenses, on filters, on CCDs... If you rotate your camera or even refocus then your flats are useless.
They're so easy and quick to do. Why not?
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Pretty much my assessment too. Rotation can have a significant effect on flats application. It all depends on tip, tilt, if you are truly on the optical centre with your sensor and the collimation of the scope.