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You can see if it the distance is too short by unscrewing the adapter slightly, and pack the "gap" with some tape. Yes it's crude, but if your image get's better, at least you'll know if you're headed in the right direction. Bit hard to shorten the distance though!
The bit about optical filter effective thickness took me a bit of a while to get my head around too. Was quite nerve racking ordering adapters from Precise Parts at a specific thickness.
Just my 2 cents worth.
DT
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