73929Re: [ccd-newastro] Re: Do Dark and Bias Frame patterns change as the camera gets older over time?
- Feb 5, 2014Mike, I think your approach is close to ideal. Mine is a compromise for sure. It works for me...~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tim StoneOn Wed, Feb 5, 2014 at 9:47 PM, Mike Dodd <mike@...> wrote:Mark Acker wrote:I used to do that, and kept a library of darks. But I stopped when I
> I think most take darks no more than about every 6 months or so.
found myself cooling the camera to temperatures that didn't match my
"standard" camera temperatures (e.g., -15C, -20C, -25C). If I could
reach, say, -18C in the camera, I wouldn't have a dark to match. So I'd
set the camera to -15C, "wasting" any reduced noise that extra 3 degrees
would have provided.
This also applied to exposure times. A library of 10- or 15-minute darks
isn't much help if I can make 17-minute light exposures one night.
Instead, I began taking a set of 10-15 darks immediately after my target
went behind the trees. I keep these darks with the light frames, and use
them just for processing that target. I'm always assured of darks with
the correct exposure and temperature.
In short, I found maintaining a good dark library to be not worth the
effort, especially when I started using ACP automation software, which
will take my darks without any action on my part.
Louisa County, Virginia USA N37.58.23 W77.56.24
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