Jerry,

I'm thinking the values you're seeing are high. For comparison, I have a 7
minute dark from my 208 that has values in the 1700-2000 range, with peaks
at 3000-ish. The dark was done with the camera set to -5C. What temp are
you set at? Temp will make a HUGE difference!

Bob
http://www.usit.com/rfreeze
-----Original Message-----
Date: Tuesday, August 25, 1998 2:02 AM
Subject: [M]: Re: 216XT Dark Frame


>> Hey Guys:
>
>I've been working with my 216 for a few months now and I was looking at the
pixel
>values in a dark frame and I think they are a little out of wack. For a
typical 30
>sec exposure, the top of the screen is displayed as black with values in
the 4500
>range. The frame gets increasingly lighter towards the bottom of the with
the
>pixel values increasing to almost 10K. Since the 216 has 64K light levels,
giving
>up almost 20% to dark current in the CCD seems excessive.
>
>Any thoughts?
>
>

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