readypat Posted September 14, 2015 Share #41 Posted September 14, 2015 Advertisement (gone after registration) Hello After looking at some of my older and newer lenses I thought of sharing the information how the focal lengths are engraved after the infinity meter or feet scale. SUMMILUX 1.4/50 (II) No.3694xxx (1997), to the right of M and under feet the 2 digit number 16 is engraved referring to a focal length of 51.6 mm. SUMMILUX 1.4/50 Asph No4266xxx, also to the right of M and under feet the 2 digit number 16 is engraved indicating a 51.6 mm focal length. Apo Summicron-M 1:2/90 Asph No.3890xxx, to the right of M and under feet the two digit number 10 is engraved indicating 91mm focal length. Elmar 1:4/90 No1920xxx LTM, to the right of M and under feet the. two digit number engraved is 00 confirming a 90 mm focal length. Elmarit M 1:2.8/90 No. 3806xxx (1997), to the right of M and under feet the two digit engraved number is 15 referring to 91.5 focal length. Summilux-M 1:4/75 Germany No. 3837xxx, to the right of M and under feet the two digits are 50. Elmarit 1:2.8/135 Canada no.2424xxx, to the right of feet and under Canada the digits are 55. (1970) Apo-Telyt 1:3.4/135, No.3853xxx (1998) to the right of M and under feet the two digits are 57. Noctilux 1:1/50 No. 2914xxx (1978) to the right of M and under feet the two digits engraved are 00. Hope this info is useful Al Link to post Share on other sites More sharing options...
Advertisement Posted September 14, 2015 Posted September 14, 2015 Hi readypat, Take a look here Small "19" beside m on distance scale Black Rigid Summicron. I'm sure you'll find what you were looking for!
readypat Posted September 15, 2015 Share #42 Posted September 15, 2015 Pico Summilux- M 1.4/75 Canada No.3150xxx, to the right of M ander feet the two digits are 00, this lens belongs to my son. Hope this info is useful. Al Link to post Share on other sites More sharing options...
pico Posted September 16, 2015 Share #43 Posted September 16, 2015 Pico Summilux- M 1.4/75 Canada No.3150xxx, to the right of M ander feet the two digits are 00, this lens belongs to my son. Hope this info is useful. Al It is useful, Al. Thank you. Apparently Canada followed their own convention. It is still a terrific, spot-on lens! Link to post Share on other sites More sharing options...
Guest JMF Posted September 17, 2015 Share #44 Posted September 17, 2015 Summilux 75 1.4 sn 35255xx under feet is written 50. Cheers JM Link to post Share on other sites More sharing options...
jc_braconi Posted September 19, 2015 Share #45 Posted September 19, 2015 I am wondering where we are going with this subject.... Link to post Share on other sites More sharing options...
pico Posted September 20, 2015 Share #46 Posted September 20, 2015 I am wondering where we are going with this subject.... Perhaps we are trying to find where/when Leica held-to or deviated from a standard. . Link to post Share on other sites More sharing options...
duckrider Posted September 20, 2015 Share #47 Posted September 20, 2015 Advertisement (gone after registration) Don't have any R-lenses here, but is the reason of this engraving the nessesarity of higher precision for M distance metering? I can't remember to have read this on R- or Visolenses. Thomas Link to post Share on other sites More sharing options...
luigi bertolotti Posted September 20, 2015 Share #48 Posted September 20, 2015 No by sure on Viso lenses, don't know about R; but I agree that this indication on lenses' barrel is strictly related to the delicacy of RF coupling... probably is an info that is useful to be found quickly by technicians who have to carry on lens'calibrations (or anyway, some kind of maintenance). Link to post Share on other sites More sharing options...
readypat Posted September 20, 2015 Share #49 Posted September 20, 2015 Luigi, Summicron - R 1: 2/50 No. 2589xxx to th right of M and under feet the two digits are 16. Regards, Al Link to post Share on other sites More sharing options...
Michael Geschlecht Posted September 21, 2015 Share #50 Posted September 21, 2015 Hello Everybody, With both "R" & "M" lenses: Some have these 2 digit numbers. Some do not. It would appear that these numbers are there to better help people who are assembling lenses to more easily co-ordinate components & hold them within tolerances. If a lens head with a focal length accurately calibrated to 1/10th of a millimeter is combined with a focusing mount of the same focal length accurately calibrated to the 1/10th of a millimeter: It is easier to fine tune the lens head & focusing mount together than it would be if each of the the 2 separate components had only been calibrated to a tolerance of 1 millimeter. Best Regards, Michael Link to post Share on other sites More sharing options...
jaapv Posted September 21, 2015 Share #51 Posted September 21, 2015 The focusing tube of lenses with a removable lens head normally will have the last three digits of the lens number scratched on the inside. Thus the both are calibrated as a unit. Link to post Share on other sites More sharing options...
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