Re: Aperture markings on vintage lens question

Jan Faul <jan@xxxxxxxxxxx> · Fri, 09 Oct 2015 10:27:14 -0400

They’re f-stops. Not all manufacturers agreed to our usual numbering system today. I have a Leitz lens which begins with f2.2 and goes up to f19 

On Oct 9, 2015, at 10:10 AM, Andrew Davidhazy <andpph@xxxxxxx> wrote:

Somebody asked me what the markings on this lens meant - suggestions? 

Presumably they are f stops or light volume designations but the numbering system
is non-conventional at least to me. They double in value from step to step as one 
would expect f numbers to allow double the amount of light to pass but I don’t 
remember having seen this particular sequence. 

Andy

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