Daphne wrote:---------------------
i've been meaning to ask about that. half my "K"
lenses dont have the 'mm'at the end :
my SMC -K 24/3.5, 35/2, 50/1.4, and 85/1.8 dont have
'mm' written. 
my SMC-K 17/4, 18/3.5, 50/1.2 and 135/2.5 have an 'mm'
engraved. does that mean thateach of those is first
version, and there's second-version siblings around?
Daphne
-----------------------------------

Hi, 
I think K-series lenses without 'mm' at the end were
manufactured between 1975 and 1977/78. Those with 'mm'
engraved were manufactured from around 1978 onward,
contemporaneously to the M-series lenses. Such later
versions seem to exist only for K-lenses that do not
have an īM'-equivalent.  
>From what I have seen these second versions have
constantly higher serial numbers.  
Enjoy,
Alexander
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