Napioa - Wind Origins

Napioa - Wind Origins
by octopus                

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Following a link in the answer provided by @Itai, I found this equation: For: focal length F minimum focal distance X extension L Then the new working distance is: F(XF +XL - Lf)/(XL -LF +f^2) I'm not sure about the validity of this equation or any of the assumptions that go into it.

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