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Forum: Pentax SLR Lens Discussion
06-19-2017, 03:13 AM
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Please be aware that the f/1.2 and the f/1.4 versions are two different beasts.
If the Porst f/1.4 is a Tomioka design, it doesn't mean that the f/1.2 is also a Tomioka.
Actually it's not.
I use the word "design" intentionally.
My Revuenon 1.2/55mm is for sure a Tomioka design, but it could have been made by Cosina.
Another possibility: Cosina made the barrel and Tomioka provided the optical elements.
At that time Japanese lens makers worked together with a very high level of integration.
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Forum: Pentax SLR Lens Discussion
06-11-2017, 08:55 PM
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Definitely Tomioka.
There are different incarnations with completely different barrel style, in both M42 and PK mount.
From the way it looks it's quite old.
I love this look, with aluminum edges.
The latest version is the one with soft plastic focusing ring, with elliptical ridges that should help to grip the ring with your fingers.
The aesthetic result is quite poor, but the more recent the build, the more modern the coating.
I don't own the f/1.4 version, just the f/1.2 (in two different optical designs, Tomioka and Cosina).
The former is great, in the same league as the Pentax 50mm f/1.2, maybe even better.
The f/1.4 design should be as good, from what I read.
Mine has enough sharpness, the right amount of undercorrected spherical aberration wide open, and almost no lateral color. It comes in PK mount, and I use it wide open (or stopped down 1 click at most), therefore I can get away with the green button, using AV setting, and forgetting about anything else but exposure compensation.
The f/1.4 design should have a similar character, it weights less, and comes at less than half the price... but is half a stop slower.
Many times I have been tempted to buy the f/1.4 too, and compare the optical signature myself.
For a reason or the other it didn't materialize, and recently the prices have gone up... so it's not at the top of my "to buy" list anymore
Cheers
Paolo
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