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Helps greatly Bert. I'd never thought of keeping the entire image train warrmed versus temp controlled focus. Makes much more sense with your observatory permanent rig of course.
I'm used to be being oversampled at FL 1000m so I'll definitely try your upsizing logic. I do dither always too, but usually only every 4th frame if shooting interleaved LRGB. Can't remember what I did for data - suspect was only every 4th Ha.
All very helpful for those starting on the CCD journey too I'd warrant.
Thanks again,
Rob
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