What is the true maximum aperture?

[lburn]

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The diaphragm leaves on my 35mm Summicron ASPH (latest version) open wider than they are at the marked f2 aperture. At f2 a "fringe" is visible when you look directly down on the front lens element and this disappears completely when the aperture ring is moved slightly beyond f2. The movement is only very slight before the lens comes to a stop. At which setting is the true f2 aperture?

I expect this is quite a common occurrence for those with more equipment and experience than me and apologies if this topic has been covered elsewhere .

lburn

[mjh]

I expect this is quite a common occurrence for those with more equipment and experience than me and apologies if this topic has been covered elsewhere .

Indeed it has – in a thread you’ve started yourself, about a week ago: http://www.l-camera-forum.com/leica-forum/customer-forum/212392-real-maximum-aperture-setting.html.

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