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Is this Tomioka 55mm f1.2 or what?
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PostPosted: Mon Jul 12, 2021 1:05 pm    Post subject: Is this Tomioka 55mm f1.2 or what? Reply with quote
It has 55mm filter thread, 8 aperture blades and f16 smallest aperture. It says Cosina/Cosinon but as far as I know those Cosina made 55mm f1.2 lenses were with 58mm filter thread amd 9 blades. So what do you think, Tomioka or not? How much is this worth? Optics are good as new, some scuffing on the body.

edit: m42 lens with EF-adapter mounted on Very Happy










PostPosted: Mon Jul 12, 2021 2:18 pm    Post subject: Reply with quote
55mm filter thread means the 6/4 version made by Cosina (most commonly Available as Porst)

tb_a explained it in another thread:
tb_a wrote:
Oldhand wrote:
Well I always thought that my Revuenon was made by Cosina, but mine only has a minimum aperture of f16, so perhaps I am wrong about that.


I've found these differences on various web-sites which I think is nice to know and IMHO still somehow on topic:

Tomioka made version:

Focal length: 55mm
Filter size: 58mm
Diaphragm blades: 9
Aperture range: f/1.2 to f/16
Optical formula: 7 elements in 6 groups
Closest focus: 60cm

Cosina made version:

Focal length: 55mm
Filter size: 55mm
Diaphragm blades: 8
Aperture range: f/1.2 to f/22
Optical formula: 6 elements in 4 groups
Closest focus: 40cm

Unfortunately there is no "official" source for that available but from the different lens pictures it seems to be plausible, at least for me. Wink


PostPosted: Mon Jul 12, 2021 2:34 pm    Post subject: Reply with quote
D1N0 wrote:
55mm filter thread means the 6/4 version made by Cosina (most commonly Available as Porst)

tb_a explained it in another thread:
tb_a wrote:
Oldhand wrote:
Well I always thought that my Revuenon was made by Cosina, but mine only has a minimum aperture of f16, so perhaps I am wrong about that.


I've found these differences on various web-sites which I think is nice to know and IMHO still somehow on topic:

Tomioka made version:

Focal length: 55mm
Filter size: 58mm
Diaphragm blades: 9
Aperture range: f/1.2 to f/16
Optical formula: 7 elements in 6 groups
Closest focus: 60cm

Cosina made version:

Focal length: 55mm
Filter size: 55mm
Diaphragm blades: 8
Aperture range: f/1.2 to f/22
Optical formula: 6 elements in 4 groups
Closest focus: 40cm

Unfortunately there is no "official" source for that available but from the different lens pictures it seems to be plausible, at least for me. Wink


Well except that my lens is f1.2 to f16 and closest focus is 50cm.

Hmm.

edit:

https://lens-db.com/tomioka-kogaku-auto-tominon-55mm-f12-1970/

That is where I got my information. Anyway, thanks for your thoughts! Still not convinced though Very Happy


PostPosted: Mon Jul 12, 2021 2:51 pm    Post subject: Reply with quote
Close focus distance is the part nobody seems to agree upon. This is the Cosina made Porst version: https://lens-db.com/porst-color-reflex-mc-auto-55mm-f12/ And here a 58mm thread Cosina: https://lens-db.com/cosina-55mm-f12-mc/

I think Cosina took over the Tomioka consumer lens production at some point. (Tomioka focussed on Business customers)


PostPosted: Mon Jul 12, 2021 2:57 pm    Post subject: Reply with quote


A sample picture wide open. This lens is so much fun Smile


PostPosted: Mon Jul 12, 2021 3:06 pm    Post subject: Reply with quote
Definitely the 6/4 version. The 7/6 is a bit more soap bubbly. Still a very nice lens


PostPosted: Mon Jul 12, 2021 3:08 pm    Post subject: Reply with quote
D1N0 wrote:
Close focus distance is the part nobody seems to agree upon. This is the Cosina made Porst version: https://lens-db.com/porst-color-reflex-mc-auto-55mm-f12/ And here a 58mm thread Cosina: https://lens-db.com/cosina-55mm-f12-mc/

I think Cosina took over the Tomioka consumer lens production at some point. (Tomioka focussed on Business customers)


Yes, I have read those same things. However now I found the exact copy of my lense, down to the screwholes. Maybe this is the same model. If only there was a way to know for sure. Very Happy

https://lens-db.com/tomioka-auto-yashinon-55mm-f12-1970/


PostPosted: Mon Jul 12, 2021 3:48 pm    Post subject: Reply with quote
D1N0 wrote:
Definitely the 6/4 version. The 7/6 is a bit more soap bubbly. Still a very nice lens


I thought to take some bubbly pics, how does these look to you? Is this soap bubbly? Very Happy





PostPosted: Mon Jul 12, 2021 4:37 pm    Post subject: Reply with quote
Take a look at this album with the Revuenon 55mm 1.2 (not mine). https://www.flickr.com/photos/95859572@N06/albums/72157705757485924/with/48443729706/


PostPosted: Mon Jul 12, 2021 6:43 pm    Post subject: Reply with quote
D1N0 wrote:
Take a look at this album with the Revuenon 55mm 1.2 (not mine). https://www.flickr.com/photos/95859572@N06/albums/72157705757485924/with/48443729706/


Thanks, looks the same to me Smile


PostPosted: Mon Jul 12, 2021 11:49 pm    Post subject: Reply with quote
D1N0 wrote:
Close focus distance is the part nobody seems to agree upon. This is the Cosina made Porst version: https://lens-db.com/porst-color-reflex-mc-auto-55mm-f12/ And here a 58mm thread Cosina: https://lens-db.com/cosina-55mm-f12-mc/

I think Cosina took over the Tomioka consumer lens production at some point. (Tomioka focussed on Business customers)

Yashica took over Tomioka. https://en.m.wikipedia.org/wiki/Yashica
Quote:
in August 1968, Yashica finally acquired its lens manufacturer, the Tomioka Optical and Machine Manufacturing Co., Ltd. (later renamed the Tomioka Optical Co. Ltd.).[3] By this time, Tomioka was one of the largest and most reputable lens manufacturers in Japan.

October 1983, Yashica Company Ltd. was acquired by ceramics giant Kyocera.

Yashica was a Japanese manufacturer of cameras, originally active from 1949[1] until 2005[2] when its then-owner, Kyocera, ceased production.



PostPosted: Tue Jul 13, 2021 12:08 am    Post subject: Reply with quote
Devnull0 wrote:
D1N0 wrote:
Take a look at this album with the Revuenon 55mm 1.2 (not mine). https://www.flickr.com/photos/95859572@N06/albums/72157705757485924/with/48443729706/


Thanks, looks the same to me Smile

You can't judge the manufacturer based on rendering, all rendering can tell you is its a similar formula, you have to look at the construction of the lenses in question to be able to decipher if they were made by the same manufacturer.


PostPosted: Wed Jul 14, 2021 11:37 pm    Post subject: Re: Is this Tomioka 55mm f1.2 or what? Reply with quote
Devnull0 wrote:
. . .
So what do you think, Tomioka or not?

Perhaps a Tomioka design manufactured or assembled by Cosina?
Isn't that M42 cut rear element a Tomioka (design) trademark - so to speak?


Devnull0 wrote:
How much is this worth?
. . .

Put it up for auction and you'll find out quickly. Smile


Devnull0 wrote:
. . . However now I found the exact copy of my lense, down to the screwholes. Maybe this is the same model. If only there was a way to know for sure. Very Happy

https://lens-db.com/tomioka-auto-yashinon-55mm-f12-1970/

Except your Cosinon appears to be multi coated. If anything, your copy might be "better" than the linked Yashinon?

My Vivitar 55mm f/1.2 M42 is also multi coated ("VMC") and was also made by Cosina (according to the information here: http://camera-wiki.org/wiki/Vivitar_serial_numbers
That page also suggests my Vivitar's 946... serial number indicates it was built in (most likely) 1974.
And Devnull0's Cosinon has a 741... serial number. Might that indicate 1974 production? Anyone know?

Also, for what it's worth: Devnull0's Cosinon, the Yashinon Devnull0 linked to and my Vivitar all appear to have their infrared focusing marks in the same location.

Regarding the optical layout, I don't have a diagram for the Vivitar, but literature I've seen says their M42 f/1.2 has 7 elements in 5 groups.


This is my lens:


#1


#2


PostPosted: Thu Jul 15, 2021 1:07 pm    Post subject: Reply with quote
So that makes three versions of the 55mm 1.2 A 7/6 58mm filter (Revuenon) A 7/5 55mm filter (Cosinon/Vivitar/Yashica?) and a 6/4 55mm Filter (Porst)


PostPosted: Sat Jul 17, 2021 11:10 pm    Post subject: Reply with quote
Devnull0 wrote:


A sample picture wide open. This lens is so much fun Smile


Great bokeh! An interesting lens to own I'm sure Smile


PostPosted: Tue Jan 25, 2022 2:23 pm    Post subject: Reply with quote
Hello all, I know this is an older topic, but I just wanted to confirm that it is a Tomioka lens.
Not sure what version, as mine (and yours probably also) has 8 aperture blades, but the smallest aperture is F16, and filter thread is 55mm.

The only difference is the text on the front of the lens and it looks like mine is a bit older, 1973 instead of 1974.
My version says also "Tomioka" on the front.

Also note that mine is radioactive, and yours probably also.
Not sure if all versions of this lens are, but it is always good to know for safe storage.

#1


#1


#2


PostPosted: Tue Jan 25, 2022 4:34 pm    Post subject: Reply with quote
mavinom wrote:
Hello all, I know this is an older topic, but I just wanted to confirm that it is a Tomioka lens.
Not sure what version, as mine (and yours probably also) has 8 aperture blades, but the smallest aperture is F16, and filter thread is 55mm.

The only difference is the text on the front of the lens and it looks like mine is a bit older, 1973 instead of 1974.
My version says also "Tomioka" on the front.

Also note that mine is radioactive, and yours probably also.
Not sure if all versions of this lens are, but it is always good to know for safe storage.

#1


#1


#2


just quoting for the pics


PostPosted: Tue Jan 25, 2022 6:52 pm    Post subject: Reply with quote
Like 1 Like 1


PostPosted: Tue Jan 25, 2022 8:33 pm    Post subject: Reply with quote
There is a lot of confusion about these lenses. Different filter threads 7/6 designs 7/5 designs 6/4 Designs (porst)Tomioka or not. My theory about Tomioka is they stopped producing consumer lenses to focus on industrial work. They were already cooperating with Cosina which took over their lens portfolio and produced the lenses from then on with a short period of both names being on the lenses. If you want to know which design you have you could take the lens apart to examine it is it 7/6 or 7/5 or 6/4.


PostPosted: Wed Jan 26, 2022 8:49 am    Post subject: Reply with quote
Is there actually anything else of 1.2/55mm in m42 then Tomioka?


PostPosted: Wed Jan 26, 2022 9:12 am    Post subject: Reply with quote
Pancolart wrote:
Is there actually anything else of 1.2/55mm in m42 then Tomioka?


A very good question.
I can't think of anything other than Tomioka sourced 55mm f1.2 lenses in M42.
There are many others in alternate mounts - Canon FL and FD, Nikkor, Cosina, Olympus and possibly Fujinon (or was that a 50mm?)


PostPosted: Wed Jan 26, 2022 11:30 am    Post subject: Reply with quote
The Porst 55mm F1.2 in 6/4 wasn't a Tomioka design I guess. But maybe that only came in K-mount for Cosina made cameras.


PostPosted: Wed Jan 26, 2022 2:09 pm    Post subject: Reply with quote
Several photos of this lens surfaced several years ago. Perhaps an experiment. Never put in regular production.



PostPosted: Thu Jan 27, 2022 11:04 am    Post subject: Reply with quote
casualcollector wrote:
Several photos of this lens surfaced several years ago. Perhaps an experiment. Never put in regular production.


And most probably also Tomioka Smile.


PostPosted: Thu Jan 27, 2022 4:19 pm    Post subject: Reply with quote
Perhaps, but I think not, as it did not have the cutaway rear element for the aperture pin.
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