Started 8 months ago | Discussions thread
Leonard Shepherd
Leonard Shepherd Forum Pro • Posts: 17,750
Re: 600PF??

Rob Blight wrote:

500PF has a front filter thread diameter of 95mm, not 77mm.

Sorry - my mistake.

This means a 600mm f5.6 needs a 107 mm minimum front element and a lens diameter in excess of 112 mm.

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Leonard Shepherd
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