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[QUOTE=The_bluester]
I wish I had the ability to adjust the back focus with my main scope. The WO Z61 has an adjustable flattener. It is currently set to the "mandatory" 12.9 mm but I can easily wind it back to 10.4 mm which would give me the 55 mm back focus.
Just out of curiosity, what does the placement of the lens have to do with back focus? If the vendor says 55 mm, then wouldn't that be because of the setup with the flattener.
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