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Old 11-12-2017   #38
cassel
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cassel is offline
Join Date: Oct 2008
Posts: 655
Definitely a strange thing - this tab mark

The original article addresses this confusion but doesn't really fully explain it- i.e. barrel length is NOT the whole story when calculating focal length (that would only only apply to single element lenses). It's complicated and it's a combination of the elements in a particular barrel that determine exact focal length.

At least, that's my take on the info. out there - NOT an expert, just a reader
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