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Rickvanman

Flat Frames - White or Grey?

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HI, I'm still getting to grips with the whole calibration frames thing, and I seem to recall reading somewhere that the flat frames shutter speed needs to be adjusted so that the resulting image is a kind-of medium grey colour, and not white. is this correct?

Appreciate any pointers.

Thanks :o) 

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The colour of flats is not that important but even illumination is.

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What it means by grey and not white, is that the flats shouldn't be saturated.

If you have an exposure that's too long, then every single pixel will be at maximum brightness and there'll be no variation across the image. Whereas you should be able to see any vignetting, finger prints, dust bunnies, etc. These will appear as slightly darker areas, but only if the image isn't saturated.

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Just use auto exposure mode, it's the one time in AP when the camera can get it right on its own!

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