My 15mm does feature the 4 feet mark and the front lens diameter is 69 mm (measured with a caliper). It's a K SMC PENTAX 1:3.5/15, sn 5068171. Fabio
Fabio, is it possible to get a more precise measure? 68,6 and 69,8 seems to pertain to the two different types and your 69mm measure lies about in between...
It would be interesting to get Antti-Pekka's and Vic's measures too.
Andre
Non-ASP? Andre (SMC-T 8014040) 68mm (approx.) Stephen (SMC-K 7368xxx) 68 to 69mm Rod (SMC-A) 68,6mm (caliper)
Unknown: Fabio (SMC-K 5068171) 69mm Antti-Pekka (SMC-K 505xxxx) ? Vic (SMC-K 7367862) ?
ASP? Bob (SMC-T 8013862) 69.85mm
