That is correct, you need the model with the orange "R" on the rewind knob to use the f 1.4


Quote Originally Posted by AOCo View Post
I don't have this lens so I'm not so sure, but according to the R on the rewind knob, which is green, this seems to be an earlier model, not suitable for use with 1.4/50 takumar. Serial number is 796871.