Doug S replied to the topic 'For those with focus issues' in the forum. 1 year ago

Hi Peter...ok, that means that the focuser has a pretty coarse thread pitch. I'm not used to that. Celestron has a typical thread pitch of 0.75um/rev, leading to a 0.13um/EAF step, so I get many more steps in my CFZ. Just wondering out loud, I wonder at the measured low counts/CFZ, maybe the 10:1 gear would have been an interesting test to get more sensitivity? I'm not recommending anything other than what EAF recommends, but it does make me wonder. Martha can measure and confirm (or not) if she has about what you have. As long as it works... Cheers, Doug

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