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Ken
I have had this happen a few times as well. It isn't consistent.
I take a neon calibration image and then take a 10 min exposure of a spectra. The image on the screen (and saved version) is the original calibration image. This means I have just wasted the 10 min exposure.
It only sometimes happens. I assume it is a failure in the camera to wipe the original image.
Don't know why it happens though.
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