[AZ-Observing] Re: Flats and Bias

Hello Stan,

Usually just turning off the drive or disengaging it works fine. You 
will be surprised at how many stars show up at twilight on the CCD 
image.

Jeff

At 12:03 -0700 07/17/2007, Stan Gorodenski wrote:
>p.s.., I should have added that slewing the telescope greatly reduces
>the integration time over a pixel of any  star in a twilight flat and so
>it seems one could completely eliminate the presence of stars for all
>practical purposes.
>Stan
>
>Stan Gorodenski wrote:
>
>>Brian,
>>
>>Finally, since there is always the danger of still imaging stars during
>>the twilight, what about slow slewing the telescope in random directions
>>as it is integrating? Am I correct that your reference to dithering is
>>probably doing the same thing?
>>Stan

-- 
Jeff Hopkins
HPO SOFT
Counting Photons
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Hopkins Phoenix Observatory
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Phoenix, Arizona 85033-2439 U.S.A.
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