[AZ-Observing] Re: Flats and Bias

It just occurred to me, why not take a flat during the daylight? One 
would have to reduce the light coming in, maybe with a mylar solar 
filter. Does the sun in the sky create too much of a flux gradient 
across the chip no matter where you might take a flat in the sky? There 
obviously is a problem with this method since it does not seem to be 
mentioned in the sources I read.
Stan


Jeff Hopkins wrote:

>Hello Jimmy,
>
>You should have bought a copy of "AutoStar CCD Photometry." 
>http://www.hposoft.com/ASCCD.html
>
>  
>
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