On Wed, 9 Sep 2009 12:10:48 -0700 (PDT), solstici
wrote:

I've to choose between a SBIG-ST7 and a SBIG-ST8 (with autoguiding)
cameras. I want to use it in all my telescopes, assuming I need a
focal reducer for LX200. Mainly, I use for photometry, astrometry,
comet imaging and asteroid occultations of stars.

Which is the best camera for my preferences?

The two cameras have essentially identical specifications, except for
the physical chip size. So it all comes down to looking at the focal
lengths you will be using each scope at, and the resulting FOVs. If the
targets you are interested in fit on an ST7, then that is certainly your
more economical choice. If not, you'll want to consider the ST8 instead.

For any of these applications, the ST10 is a somewhat better choice.
However, it comes with a larger price tag, as well.
_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com