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Mamiya-Sekor 1:2 f=50mm any info?
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PostPosted: Wed Jan 13, 2021 6:39 pm    Post subject: Mamiya-Sekor 1:2 f=50mm any info? Reply with quote
Anybody knows anything about this type Mamiya-Sekor (look at focusing ring). I cannot find any info on it.
The lens says Mamiya-Sekor 1:2 f=50mm No. 50763. I yet have to try it out.



PostPosted: Wed Jan 13, 2021 7:49 pm    Post subject: Reply with quote
I haven't seen a Mamiya 50/2 of that appearance before. At a guess I would say it's a very early version of the lens. The focussing ring looks very similar to the earlier versions of the Mamiya 58/1.7 lens, as well as the prismat lenses the 100/3.5, 38/3.5 and 48/1.9 ( http://mamiya-nc-m42.mflenses.com/prismat_ph.htm ), and also the Sekor Nikkorex lenses ( http://www.nicovandijk.net/nikkorexlenses.htm )

The colouring of the focus scale differs as do other aspects of the general styling, it would seem to form a bridge between Mamiyas' very early lenses, and those made for their later M42 camera line.


PostPosted: Wed Jan 13, 2021 7:52 pm    Post subject: Reply with quote
By the way, the camera is a Mamiya Prismat CWP from ‘64. I guess the lens is from the same year. The lens doesn’t appear in this list:

https://en.wikipedia.org/wiki/List_of_Mamiya_products

If I’m not wrong, Mamiya started producing its own lenses with the SX line. Does anybody know who produced this lens?


PostPosted: Wed Jan 13, 2021 7:56 pm    Post subject: Reply with quote
Alun Thomas wrote:
I haven't seen a Mamiya 50/2 of that appearance before. At a guess I would say it's a very early version of the lens. The focussing ring looks very similar to the earlier versions of the Mamiya 58/1.7 lens, as well as the prismat lenses the 100/3.5, 38/3.5 and 48/1.9 ( http://mamiya-nc-m42.mflenses.com/prismat_ph.htm ), and also the Sekor Nikkorex lenses ( http://www.nicovandijk.net/nikkorexlenses.htm )

The colouring of the focus scale differs as do other aspects of the general styling, it would seem to form a bridge between Mamiyas' very early lenses, and those made for their later M42 camera line.


Thanks for the info. That seems plausible. I wonder who produced these pre-screwmount prismat lenses. Mamiya itself?


PostPosted: Wed Jan 13, 2021 8:31 pm    Post subject: Reply with quote
From what I can gather the 'Sekor' name refers to a separate company and plant bought by Mamiya postwar ( https://forum.luminous-landscape.com/index.php?topic=38245 see comments in this thread ) to make lenses and shutters themselves, something they formerly used to outsource.


PostPosted: Thu Jan 14, 2021 3:24 am    Post subject: Reply with quote
caspert79 wrote:
By the way, the camera is a Mamiya Prismat CWP from ‘64. I guess the lens is from the same year. The lens doesn’t appear in this list:

https://en.wikipedia.org/wiki/List_of_Mamiya_products

If I’m not wrong, Mamiya started producing its own lenses with the SX line. Does anybody know who produced this lens?


Afaik, the 50/2 of the Prismat is the same lens made by Mamiya till the 50/2 in Qbm mount.
Tokina made the lenses TL/DTL version except the 50 and 55 mm (made by Mamiya).
So, the 55/1,4 and 55/1,8 SX lenses are the same than TL/DTL version.


PostPosted: Thu Jan 14, 2021 6:13 am    Post subject: Reply with quote
papasito wrote:
caspert79 wrote:
By the way, the camera is a Mamiya Prismat CWP from ‘64. I guess the lens is from the same year. The lens doesn’t appear in this list:

https://en.wikipedia.org/wiki/List_of_Mamiya_products

If I’m not wrong, Mamiya started producing its own lenses with the SX line. Does anybody know who produced this lens?


Afaik, the 50/2 of the Prismat is the same lens made by Mamiya till the 50/2 in Qbm mount.
Tokina made the lenses TL/DTL version except the 50 and 55 mm (made by Mamiya).
So, the 55/1,4 and 55/1,8 SX lenses are the same than TL/DTL version.


So you say that the Auto Mamiya-Sekor, should be optically the same lens as my Mamiya-Sekor without the 'Auto' designation?


PostPosted: Thu Jan 14, 2021 12:37 pm    Post subject: Reply with quote
caspert79 wrote:
papasito wrote:
caspert79 wrote:
By the way, the camera is a Mamiya Prismat CWP from ‘64. I guess the lens is from the same year. The lens doesn’t appear in this list:

https://en.wikipedia.org/wiki/List_of_Mamiya_products

If I’m not wrong, Mamiya started producing its own lenses with the SX line. Does anybody know who produced this lens?


Afaik, the 50/2 of the Prismat is the same lens made by Mamiya till the 50/2 in Qbm mount.
Tokina made the lenses TL/DTL version except the 50 and 55 mm (made by Mamiya).
So, the 55/1,4 and 55/1,8 SX lenses are the same than TL/DTL version.


So you say that the Auto Mamiya-Sekor, should be optically the same lens as my Mamiya-Sekor without the 'Auto' designation?


Yes.The same very good lens.it was produced for more than 20 years, with coated changes only. Very solid rendering


PostPosted: Thu Jan 14, 2021 12:51 pm    Post subject: Reply with quote
papasito wrote:
caspert79 wrote:
papasito wrote:
caspert79 wrote:
By the way, the camera is a Mamiya Prismat CWP from ‘64. I guess the lens is from the same year. The lens doesn’t appear in this list:

https://en.wikipedia.org/wiki/List_of_Mamiya_products

If I’m not wrong, Mamiya started producing its own lenses with the SX line. Does anybody know who produced this lens?


Afaik, the 50/2 of the Prismat is the same lens made by Mamiya till the 50/2 in Qbm mount.
Tokina made the lenses TL/DTL version except the 50 and 55 mm (made by Mamiya).
So, the 55/1,4 and 55/1,8 SX lenses are the same than TL/DTL version.


So you say that the Auto Mamiya-Sekor, should be optically the same lens as my Mamiya-Sekor without the 'Auto' designation?


Yes.The same very good lens.it was produced for more than 20 years, with coated changes only. Very solid rendering


Thank you, dimensions look similar indeed.


PostPosted: Thu Jan 14, 2021 6:12 pm    Post subject: Reply with quote
What mount is it? Looks pretty "modern" to me compared to old Prismat series.

PH series has a weird mount; NP series is just Exakta (or very similar).

The Mamiya sekor m42 mount 55mm 1.4 has a silver ring version as well but this 50mm f/2 focus ring does look different.


PostPosted: Thu Jan 14, 2021 6:15 pm    Post subject: Reply with quote
vivaldibow wrote:
What mount is it? Looks pretty "modern" to me compared to old Prismat series.

PH series has a weird mount; NP series is just Exakta (or very similar).

The Mamiya sekor m42 mount 55mm 1.4 has a silver ring version as well but this 50mm f/2 focus ring does look different.


This is M42. The camera is a Mamiya CWP, the first Mamiya screwmount camera.


PostPosted: Thu Jan 14, 2021 6:31 pm    Post subject: Reply with quote
caspert79 wrote:
vivaldibow wrote:
What mount is it? Looks pretty "modern" to me compared to old Prismat series.

PH series has a weird mount; NP series is just Exakta (or very similar).

The Mamiya sekor m42 mount 55mm 1.4 has a silver ring version as well but this 50mm f/2 focus ring does look different.


This is M42. The camera is a Mamiya CWP, the first Mamiya screwmount camera.


Thanks. Then I tend to believe it just has the appearance difference of other Mamiya 50mm f/2's.


PostPosted: Thu Jan 14, 2021 7:49 pm    Post subject: Reply with quote
As others have said, the styling looks identical to the Mamiya-Sekor 58 1.7 (which is a super awesome lens, btw). The 58mm also does not say AUTO, just Mamiya-Sekor.


PostPosted: Thu Jan 14, 2021 8:16 pm    Post subject: Reply with quote
KEO wrote:
As others have said, the styling looks identical to the Mamiya-Sekor 58 1.7 (which is a super awesome lens, btw). The 58mm also does not say AUTO, just Mamiya-Sekor.


Aha, you are right. I just realized the 58mm 1.7 also has an M42 version. So OP's 50mm f/2 could be in that series.
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