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Samir Kharusi | all galleries >> Galleries >> Autoguiding a C14 at f11 > Typical Flat
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04-OCT-2004

Typical Flat

Even at f11 there's still significant vignetting just from the restricted ID available with using a T-thread based system. The above is a typical flat frame pointing towards the sky at dawn. I typically shoot 4 frames, at ISO 100 (to minimise noise) at various orientations and stack them. That should help smooth out sky gradients. I then extract the Luminosity channel and that becomes my Master Flat.

Canon EOS 1Ds
1s f/0.7 iso100 full exif

other sizes: small medium large original auto
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