[AZ-Observing] Re: Flats and Bias
- From: Jeff Hopkins <phxjeff@xxxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Tue, 17 Jul 2007 19:41:01 -0700
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
http://www.hposoft.com/Astro/astro.html
Hopkins Phoenix Observatory
7812 West Clayton Drive
Phoenix, Arizona 85033-2439 U.S.A.
(623)849-5889
(623) 247-1190 (Fax)
www.hposoft.com
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