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TEST: Mamiya Sekor E 1.4/50 1.7/50 1.7/50S 2/50S
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PostPosted: Fri Sep 29, 2023 4:02 pm    Post subject: TEST: Mamiya Sekor E 1.4/50 1.7/50 1.7/50S 2/50S Reply with quote
Probably first-ever careful comparison of the four Mamiya Sekor E/EF standard lenses:

* Mamiya Sekor EF 1.4/50mm
* Mamiya Sekor E 1.7/50mm
* Mamiya Sekor E 1.7/50mm S
* Mamiya Sekor E 2/50mm S

It's amazing how good the EF 1.4/50mm is, compared to the slower family members:

CLICK ON THE IMAGE TO SEE THE FULL RESOLUTION!



Mamiya really here is turning things upside down: Usually the fast lenses are always (at least slightly) worse than their contemporary slower counterparts - but not here! The Mamiya Sekor EF 1.4/50mm at f1.4 is better than the 1.7/50mm at f1.7, and both are better than the 2/50mm!

S


PostPosted: Fri Sep 29, 2023 4:23 pm    Post subject: Reply with quote
What the f/1.4 and f/1.7 do both really good, is that they’re very sharp wide open (close distance). I have the f/2 as well, but there’s something wrong with mine.


PostPosted: Fri Sep 29, 2023 4:52 pm    Post subject: Reply with quote
caspert79 wrote:
What the f/1.4 and f/1.7 do both really good, is that they’re very sharp wide open (close distance).

I haven't really tested that - but I'm aware of your findings.

I have noticed, however, that the Sekor SX 1.7/85mm as well as the Sekor SX 2.8/105mm seem to be optimized for portrait distances, and not for infinity. I should check that more carefully later on.

caspert79 wrote:
I have the f/2 as well, but there’s something wrong with mine.

That's something I have encountered with my (only) Sekor E 2.8/28mm. Pretty low corner perfomance, certainly much lower than with my Sekor CS 2.8/28mm samples. I suspect someone (factory?) has turned one lens by 180° ... maybe the single negative lens inside the rear element ?!?

Quality control is expensive, and Mamiya wasn't that good at it. We have it officially from Nikon - in their history pages they talk about the sub-standard quality at the "M" company which was producing SLRs for Nikon in th early 1960s ...

S
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