> Ian, > Quick way to distinguish the 135/2.5's... > 1) The old original K135/2.5 has a 58mm front filter and bayonette mount. > 2) The cheap Takumar 135/2.5 has a 52mm front filter, a bayonette mount, > and the f stops are painted different colors (plus it has Takumar >written right around the outside rim!) > 3) The oldest is the SMC Takumar 135/2.5 and it's a SCREWMOUNT lens. >There are other Takumar screwmount 135's, but the SMC f2.5 is aledged to >be the best.
There are actually TWO versions of the SMC Takumar 135/2.5 screw-mount, plus the older Super Takumar 135/2.5 screw mount. The Super Tak and first SMC are identical optically, the second SMC is a newer design and apparently better optically (I can't say for sure, since mine's a model 1) I thought that the optical formula of SMC Tak 135/2.5 model 2 was the same as "K" 135/2.5 bayonet-mount, but there could still be differences in quality due to coatings, glass formulation, etc. DJE
