[AZ-Observing] Re: Flats and Bias

Well Stan that might work. As you well know all observatories have 
long vertical shafts . :-)

Jeff

At 19:21 -0700 07/17/2007, Stan Gorodenski wrote:
>Brian Skiff wrote:
>>>>  would placing a sheet of red cellophane
>>>>  over the objective end of the telescope work...?
>>      Folks have tried all sorts of subterfuges....

>Have they tried shooting the telescope and ccd camera down a very long
>vertical shaft? At the right speed the wavelength should match the
>wavelength of the red sky color of a night sky.
>Stan

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Jeff Hopkins
HPO SOFT
Counting Photons
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Hopkins Phoenix Observatory
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