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Bert,
Have you taken repeated images with the *same* filter and seen consistent results from CCDI? It never happens for me even with a refractor (FSQ-106ED) and a very solid imaging train.
I certainly wouldn't be surprised if a very slight tilt on the filters caused problems at f/3. I'm amazed your filters are parfocal at f/3. My Astrodons need significantly different focus offsets at f/5.
Cheers,
Rick.
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