Leica Mini M

Started May 23, 2013 | Discussions thread
John Roy
Contributing MemberPosts: 572
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Re: Leica Mini M
In reply to Ray1684, Jun 2, 2013

The figures given for the lens make no sense: 28-70mm f3.5-6.4.

28mm at f3.5 gives a diameter of 8mm whereas 70mm at f6.4 gives a diaphragm diameter of 10.9mm. Why would the diaphragm change by such a strange amount? Reversing the argument, going back to 28mm, the diaphragm reduces to give a slower f stop. This is senseless.

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