Re: CCD sensitivity and resolution

On Fri, 25 Jan 2008 23:12:26 GMT, Davoud <star@xxxxxxx> wrote:

Damned near impossible. Add air/light pollution to the imponderables.

I wouldn't go that far. I have a fairly simple flux calculator in a
spread*** that does a pretty accurate job of estimating limiting
magnitude for a given sensor, exposure time, sky background, aperture,
and desired S/N. But...

I think that it would be a lot less trouble to measure the magnitude
limit over a number of exposures under ideal skies.

.... you're right, it's easy to measure, and you're going to get the most
realistic idea of your camera's performance that way.

If (and I recognize
that's a big if) Hubble GSC 2.2 is accurate, I have captured mag 21
stars with my Tak 180mm f2.8 astrograph and SBIG STL-11000 from my
suburban location.

That sounds about right. Do you recall what kind of exposure time was
required?

_________________________________________________

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

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