SMC Takumar 15mm #8014040 has a front element with a 68mm diameter, +or- 1mm.
It's impossible for me to say its curvature is more or less than the one on the photo. This difference must be subtle. Andre >Hi Andre, > >> The very interesting article in Spotmatic left one question >> unanswered. Can we measure the diameter of the 15mm front element >> and know which one it is, or is the difference too small? > >The Spotmatic article did not say how they differ, only that they do >differ. Maybe everyone who ons an "SMC 1:3.5/15" lens should take it >out and compare the front element size and curvature very very carefully >with the lens shown in >http://kmp.bdimitrov.de/lenses/primes/ultra-wide/K15f3.5-ii.html > >If you notice a difference, then you are holding one of the few >aspherical variations of the 15/3.5. > >Cheers, >Boz --
