Ludwig der 13te Posted January 11, 2007 Share #1 Posted January 11, 2007 Advertisement (gone after registration) Hello members of the Leica forum, I just bought an old Elmar-M 2.8/50. [ATTACH]21434[/ATTACH] Does anybody know the reason for #19 engraved? Cheers Ludwig PS: folks in german forum tell me that I`ve got an 2.8/51.9 Elmar ? Picture with Macro-Elmarit-R 60 at 5D Link to post Share on other sites More sharing options...
Advertisement Posted January 11, 2007 Posted January 11, 2007 Hi Ludwig der 13te, Take a look here Strange number on my Elmar. I'm sure you'll find what you were looking for!
marknorton Posted January 12, 2007 Share #2 Posted January 12, 2007 The folks in the German forum are correct. These figures reflect the fact that manufacturing tolerances can affect the focal length of the completed lens. The 19 in this case does indeed mean the measured focal length is 51.9mm. Other lenses have it as well. My pre-ASPH 50/1.4 has "13" and even my 50/1.4 ASPH has "14", so it's not just older lenses which have it. Keep in mind that the effective focal length changes a little as the subject distance changes. Link to post Share on other sites More sharing options...
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