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Subject: [M]: RE: CCD auto dark?
From: Michael Hart
Reply To: mapug@shore.net
Date: Sun Oct 27 03:22:38 1996

Bruce Segal wrote on 10/25/96:

>When using the automatic dark field exposure feature a window asks
>you to put up grey card yes/no. What does this mean?

In PictorView 2.0 your talking about an automatic flat field exposure, the
second field down, followed by automatic dark frame. If your at home, you
can use the automatic flat field exposure to take a flat by putting a medium
gray card evenly illuminated in front of your scope. Observatories mount
a screen in the dome with lights to evenly illuminate it. Personally,
I prefer not using the auto flat function. Forget using it at a star party.
Good flats have a high signal to noise ratio.

For now, try using white plastic over the scope on an overcast day or
dawn/twilight. Index and mark the CCD orientation.

Michael Hart
mhart@netexpress.net