I don't have direct evidence for the Zeiss only reviews and reputation.
That said, the Pentax, in fact all Pentax 50mm/55mm* are classic
designs. A bit soft wide open, softer in the corners on film. Stop down
to f4.0 or 5.6 and they become sharp as hell, but I expect you noticed
this. This behavior is by design, to give a soft look to portraits
while enabling greater sharpness for other purposes.
The Zeiss is supposed to be a more modern design but still has the
classic behavior, sharpening up at f2.8, getting sharper as you stop
down to about f8.0. They are similar beasts, but the Zeiss is slightly
sharper.
Mechanically the Zeiss is built like an old fashioned Takumar M42 screw
mount lens, all high quality metal plus a metal bayonet on lens hood,
something the Tak's never had. Strangely though this lens is part of
a series released in the 0's it came in Nikon F, Canon EOS, Pentax Ka,
and M42...
In case you're interested you can read God's Great Gift to
Photography's** review of this lens, which is as opinionated and and
laughably at odds with pretty much ever other review as you might expect.
*The 43mm Ltd, and 40mm M lenses share this characteristic to some
extent too.
**Kennyboy in his own mind, he's so sure of himself, if you didn't know
better, you might just believe him.
On 1/22/2017 11:35 AM, Steve Cottrell wrote:
On 22/1/17, P. J. Alling, discombobulated, unleashed:
KEH.com has a ZK 50mm f1.4 T* for a not outrageous price. "A" mount
equivalent. I'd buy it but I'm broke at the moment.
How do you think it compares optically to the Pentax M50/1.4 ?
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