Elmar 50mm have a lot of variations I think can publish a small book about it. it have Nickel, Chrome version. The focusing knob also have 4-5 different type. Some stop at 7 o'clock, some stop at 11 o'clock for Leica II. Some have shorter barrel, some longer, some have 4 elements (earliest one, some have 5.)
I think one is european standard and one is international standard that they start to use from the 50s. The way they can close down more indicate later batch aperture design is different too I think.
Lots and lots of information and variations for 50m elmar. I think one can find at least 20 50mm elmar to have some differences.
I suspect I have one. 3 doubtful areas:
1) There is no lens serial number. Other Elmars I have do have their s/n on the black rim at front.
2) Elmars I have seen mark its focal length as f=5cm. Mine is F=50mm.
3) Its in Germany aperture, 3.5...18. Theoretically it should be produced between 1930's to 40's. Using 50mm instead of 5cm is not the standard industrial way.
The earliest standardized 50 Elmars were originally non-interchangeable lenses converted to standardized mount in 1932: nickel, uncoated, no serial number ("o" on back of mounting flange, serial number scribed inside barrel), f=50mm (1925 to 1928), short barrel. 11 o'clock, push button knob, no infinity catch.
發表於 2013-8-7 14:22:49
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