Quote:
Originally Posted by frolinmod
I have also owned a QSI-583wsg for over a year now.
It came amazingly clean, but has developed a hot column as the chip has aged. The hot column fades away as the camera gets cold. I gather this sort of thing is common.
The only thing I don't like about the camera is the slow download time. QSI have fixed that in the 600 series.
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All CCD chips deteriorate over time from radiation damage. I read though that some high end cameras like Princeton that use vacuum chambers for the CCD do not deteriorate as much. Interesting.
My Proline16803 developed a vertical line about 2 months ago. Most 16803 chips have one or two when brand new. Mine had none.
It fades with higher cooling and dark subtracts out neatly.
Hot pixels appearing over time is common. Its nothing to do with the camera and is a fact of life with CCD chips.
There is a paper that demonstrates how these defects fade with higher cooling temps that is very demonstrative. Really though all you need to do is make new darks every 6 months or so or when you notice a new defect.
Greg.