That was what I originally thought to do but as the day (night) cools it becomes necessary to refocus and everything I read would indicate that after changing the focus the previous flats are no longer good.

Comments?

Cliff

Use the sky for flat fields, take a quick exposure at twilight.

AV

writes:
> Is there a diagram for building a light box for taking flat frames
> available somewhere? In reading the MaxIm DL manual it seems to
> indicate that the Flat Frame is only good for one focus and CCD
> orientation. so If you have to refocus or remove and replace the CCD
> you will need a new flat. I have heard of light boxes that make this
> possible but haven't seen any information on building one.
>
> Any assistance will be appreciated.
>
> Cliff
>
>

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