Quote:
Originally Posted by RickS
Hi Pete,
Dave has been pretty busy lately so I suspect you won't hear back from him soon. I also suspect he won't know the answer to your question. You should ask SBIG and/or poke around the extra data in the frame to figure out where the overscan data lies. On my 16803 camera (Apogee U16M) there is a set of 10 columns at the far right of the frame that do the trick but the SBIG driver will almost certainly map things differently.
Cheers,
Rick.
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Thanks Rick
I think it was the discussion about real vs dummy overscan that threw me. I can access my obs PC from work so I'm playing with this as a I type.
Looking at a 1200 second dark, I have a dark border to the right and bottom of the frame. However at the right side, there is a brighter line (several pixels wide) between what appears to be the edge of the image and the dark border. I wonder if this is the readout channel for the chip. I've posted a pic.
Interestingly, I have no dark border at the base of a bias frame, only to the right. Also attach a pic.
How do I distinguish the real overscan from the dummy overscan?
Quote:
Originally Posted by troypiggo
My QSI583 (Kodak KAF 8300 sensor) has 279 columns on the right. Spoke to QSI's Kevin Nelson about it, and he recommended just using the right-most 100-150 columns. So it varies from sensor to sensor, and possibly(?) camera manufacturer to manufacturer.
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Sadly, SBIG are less forthcoming - though there may be something deep in the bowels of the SBIG site - off to do some digging now
Pete