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Thanks for the info Slawomir.
I believe your system has a CFZ of around 78um so I can see why 20 steps works well for you. I think the f5.6 system produces a more defined V than my f4 optics. Are you binning for autofocus?
Why would filter offsets be less reliable?
There must be a lot of people imaging with f4 or faster systems - I wonder how are they focusing?
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