Originally posted by timw4mail There's just something about radioactive lenses...
Have Pentax (Asahi)/Pentax (Hoya)/Pentax (Ricoh) and Tamron exchanged designs at times?
The D FA 15-30 & D FA 24-70 are both Tamron designs. The DA 18-250 & 18-270 are both Tamrons. The FA 28-200 (IF) & FA 28-105 (IF) are both Tamrons.
The FA 100 F/3.5 Macro is a Cosina. The DA 12-24 is a Tokina. Tokina made the 16-50, 50-135, & 10-17 FE for Nikon & Canon mounts. Maybe the 100mm F/2.8 Macro too.
And the K 28/2 "Hollywood" is a Zeiss Distagon...