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Number engravings on old Summilux


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Hi,

What does the small vertical number engravings on the old Summilux lenses mean?

 

My version I has a small "16" engraved and the slightly later version II has "13".

Just add this number in 1/10mm to your lens focal length.

 

16 means, you have a 51,6mm lens

13 a 51,3mm

00 a 50mm etc.

if 96, then you have a 49,6mm

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