[AZ-Observing] Re: Flats and Bias
- From: Jeff Hopkins <phxjeff@xxxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Tue, 17 Jul 2007 12:24:32 -0700
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
http://www.hposoft.com/Astro/astro.html
Hopkins Phoenix Observatory
7812 West Clayton Drive
Phoenix, Arizona 85033-2439 U.S.A.
(623)849-5889
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