Frogfish Offline Upload & Sell: Off
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Great link from Serhan there.
I posted this a couple of years ago, note the optical formulae and 9 to 8 blades :
I clipped this info below when I used Pentax. I know of the Revuenon but can not remember off-hand what I heard other than where it is mentioned below ! I bought the Cosina 55/1.2 and would buy it again in a flash, it does stupendous things with specular highlights ! The Porst is reputed to be 'dreamier'.
The lens company Tomioka, of Japan, originally designed the 55mm f/1.2 lens for Yashica (whose line of lenses were called Yashinon) in M42 mount. They later went on to produce it for Cosina (Cosinon), Revue (Revuenon), Chinar (Chinon, do you see a trend here?) and with Tomioka's own brand name...wait for it...Tominon. Apparently they also built them for Vivitar (serial # beginning with 84), but I've only ever seen it for sale once. As far as I know, it was never produced in P/KA mount for Pentax, just P/K, but Tomioka did build a 'P' version for Ricoh (Rikenon). I believe Tomioka transitioned off the M42 mount to bayonet mounts in 1974.
The Tomioka 55mm f/1.2 has the following specs:
Focal length: 55mm
Filter size: 58mm
Diaphragm blades: 9
Aperture range: f/1.2 to f/16
Optical formula: 7 elements in 6 groups
Closest focus: 60cm
The Porst Color Reflex 55mm f/1.2 is a different lens, and was (bizarrely) manufactured by Cosina. On some lenses it is branded simply as "Color Reflex". This lens has the following specs:
Focal length: 55mm
Filter size: 55mm
Diaphragm blades: 8
Aperture range: f/1.2 to f/22
Optical formula: 6 elements in 4 groups
Closest focus: 60cm
Weight : 350g
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