Black metal body (no silver ring). Yellow 'EE' markings. Metal focus grip. This lens predates the date codes being stamped on the back of the lens.
1970 - 1973
Hexanon - C
f/1.2 - f/16
IR Performance Notes
The performance does drop off a little at f/16, but let's face it - you're unlikely to use that due to diffraction anyway. For the rest of the aperture settings this lens is a stellar performer.