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Hi Robert,
When I was using my DSLR camera for astrophotography and before I was going to take flats I just set it to AV(aperture priority) mode and the camera picked optimal exposure length up by itself.
And I guess you are aware that flats should be taken with your camera being at exact position as it was when you took your light frames. If you remove your camera and attach it back again there is a big change that all dust on a camera sensor and a telescope lens/mirror that are expected to be removed after applying flats wont match with the same dust in your light frames.
cheers,
Mike
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