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Mamiya-Sekor C 150mm 1:4 (645)
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PostPosted: Tue Oct 25, 2022 7:20 am    Post subject: Mamiya-Sekor C 150mm 1:4 (645) Reply with quote
Couldn't find a topic for this lens.

Mamiya-Sekor C 150mm 1:4 by The lens profile, on Flickr

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It is better behaved than the 210/4 less fringing, CFD is also better 1.5m instead of 2.5 so the same as most 135mm's. With adapter attached it is just as long as my Super-Takumar 150/4, just a lot fatter.


PostPosted: Tue Oct 25, 2022 8:19 am    Post subject: Reply with quote
I wonder what the picture on it will look like with a "native"2x teleconverter?
p.s And by the way , what is different from version f3.5 (150)?


PostPosted: Tue Oct 25, 2022 8:56 am    Post subject: Reply with quote
Very good results, it doesn't surprise me.


PostPosted: Tue Oct 25, 2022 9:34 am    Post subject: Reply with quote
sergun wrote:
I wonder what the picture on it will look like with a "native"2x teleconverter?
p.s And by the way , what is different from version f3.5 (150)?


Apart from a half stop more light the 3.5 is a very different design. Allphotolenses says it has 67mm filters (instead of 58, but I don't believe that's right. Both 58mm as other sources confirm). I don't think there is an optical difference between the 3.5 and the 3.5 n. Probably just updated focus rubber.






The 4 is a classic short tele, the 3.5 some sort of dressed down double gauss like the Pentax-m 50/2.


PostPosted: Thu Oct 27, 2022 5:24 pm    Post subject: Reply with quote
I have a single shot with this lens on the GFX 50R. Shot through two layers of glass (car windshield & store window). Seems to be a nice, capable, lightweight and compact lens.

Winter rain by Artem, on Flickr


PostPosted: Thu Oct 27, 2022 5:28 pm    Post subject: Reply with quote
Arutemu wrote:
I have a single shot with this lens on the GFX 50R. Shot through two layers of glass (car windshield & store window). Seems to be a nice, capable, lightweight and compact lens.

Winter rain by Artem, on Flickr


Nice image!


PostPosted: Thu Oct 27, 2022 9:58 pm    Post subject: Reply with quote
Arutemu wrote:
I have a single shot with this lens on the GFX 50R. Shot through two layers of glass (car windshield & store window). Seems to be a nice, capable, lightweight and compact lens.


Nice one. The lens balances nicely with my K-1 maybe de 3.5 a even a bit better since it weighs less due to the different lens formula I guess, but I also have the excellent takumar and Pentax-m 150mm. They maybe about equal IQ wise.


PostPosted: Sun Apr 23, 2023 9:30 am    Post subject: Reply with quote
I bought one and ordered a k A7R2 adapter. The issue with the native 2x converter will be 300mm. Will it be similar to the mamiya sekor 300/5.6 in terms of sharpness in the far field, not counting the darker aperture?


PostPosted: Sun Apr 23, 2023 10:21 am    Post subject: Reply with quote
If you just adapt no TC to 35mm it will be 93mm:
https://en.wikipedia.org/wiki/Mamiya_645

I guess any TC x2 would give 186mm.


PostPosted: Sun Apr 23, 2023 10:48 am    Post subject: Reply with quote
sergun wrote:
I bought one and ordered a k A7R2 adapter. The issue with the native 2x converter will be 300mm. Will it be similar to the mamiya sekor 300/5.6 in terms of sharpness in the far field, not counting the darker aperture?


A TC is usually detrimental to sharpness because it is effectively an optical crop, so I wouldn't think so.


PostPosted: Sun Apr 23, 2023 10:52 am    Post subject: Reply with quote
Slalom wrote:
If you just adapt no TC to 35mm it will be 93mm:
https://en.wikipedia.org/wiki/Mamiya_645

I guess any TC x2 would give 186mm.


No it won't It will still be 150mm. On 645 it has an equivalent field of view to a 93mm lens on full frame. On larger formats there is more field of view for any given focal length over a smaller format.


PostPosted: Thu May 04, 2023 8:07 pm    Post subject: Reply with quote
I got the adapter, there is no infinity, it does not twist two or three millimeters. Today I made an album on Google photos.
https://photos.app.goo.gl/9HTEzDEvFffURvKcA

Олеся-1 by Сергей Пашнин, on Flickr


PostPosted: Fri May 05, 2023 12:27 pm    Post subject: Reply with quote
sergun wrote:
I got the adapter, there is no infinity, it does not twist two or three millimeters. Today I made an album on Google photos.
https://photos.app.goo.gl/9HTEzDEvFffURvKcA

Олеся-1 by Сергей Пашнин, on Flickr


As far as I know there are 2 M645 adapters on the market. A cheap Chinese one, and a better one from Fotodiox. With the cheap one, I couldn’t focus any Mamiya 645 lens to infinity. My 645 lenses worked perfect with the Fotodiox one, except for my 105-210/4.5; I had this lens adjusted to reach infinity.


PostPosted: Sat Aug 05, 2023 7:21 pm    Post subject: Reply with quote
150/4 Today. I decided to buy 300/5.6 remotely today. We'll see.
stray dog by Сергей Пашнин, on Flickr


PostPosted: Sat Aug 05, 2023 11:10 pm    Post subject: Reply with quote
Mamiya-Sekor C 150mm 1:3.5

Phase One + P25 f/5.6 1/180 с; ISO 100

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