Originally posted by Dubnut71 All the M42 stuff is marked Super Takumar, the bayonet stuff is SMC I reckon, will get a few more details tomorrow!!!!
Double check all those taks, especially the 50mm ones because the ES, ES II and Spot F support open aperture metering which requires S-M-C Takumar or SMC Takumars. There are also a few very very late Super Taks with the lugs including some 55/1.8 and can be identified by the lug on the mount. Given that there are 2 ES in that lot and 4 55s, there is a chance there is a S.T. 55 with that lug.