[Aavso-photometry] A question about reflex digital cameras

[arne]

MARVIN wrote:
> Hi All,
> 
> I have a question for the list, and I need your help. 
> I'm going to buy a reflex digital camera (probably Canon or Nikon), and I would like to know if this kind of device, applied to the primary focus of a telescope (8" for example), can be used to do variable star photometry.
> 
The answer is "yes", sort of.  You need to be careful, and to not
expect 0.01mag precision.  See the powerpoint presentation by
John Hoot at the last SAS meeting:
http://www.socastrosci.org/2007 pdf/Hoot.pdf
and also the investigations by Christian Buil:
http://www.astrosurf.com/buil/
(where he has tested various Canon digital SLRs, plus
describes the problems and modifications)
Arne