Tomioka, Zeiss, Mamiya and 55/1.4 design.

Gabriel · Joined: 01 Sep 2009 Posts: 2 Location: Paris

As I had some doubts that the Porst 55/1.2 PK could be using the same formula as the Tomioka 55/1.2, I opened mine:

This is the rear optics of the lens. On the right the outer rear element, on the left a block which is behind the diaphragm (diaphragm should be on top of it). This is a block of 3 elements, including two cemented ones (the black line is between those two elements).
Verdict: 4 rear elements, including two cemented ones. With the 3 front elements that is a total of 7 elements and not 6, which points to the fact that it could indeed be the same formula as the Tomioka 55/1.2.

estudleon · Joined: 15 May 2008 Posts: 3754 Location: Argentina

Some 1,2/50-55 lenses have 7 elements. But we have to see if the distance between elements, class and curvature of glass, location of the blades, etc, are the same too.

Difficult things. Rino.

no-X · Posted: Mon Jan 25, 2010 4:04 pm Post subject:

Thank you very much. I hope this will end the doubts of this discussion:

http://forum.mflenses.com/so-i-got-this-from-a-2nd-hand-site-porst-55-1-2-t22842,start,75.html

aidaho · Joined: 29 Apr 2018 Posts: 456 Location: Ukraine

I'm currently pretty intrigued with Cosina-made all-black touch-radioactive Mamiya/Sekor 55mm F1.4.
Just as I've guessed from Flickr shots, it is not that good when it comes to carrying bokeh quality into the distance, but relative close ups are ranging from ok to impressive.
Inside, it's a solid build too.

My question is: was there ever a multicoated 55/1.4 by Cosina? (under any branding)
I'm aware of multicoated Tomiokas, and Mamiya-made 55/1.4s are likely all multicoated, but I'm interested in this exact optical block.
I haven't found one so far, but it was produced in so many shells and under so many brands, I might be missing some.

Oldhand · Posted: Thu Jun 04, 2020 10:47 am Post subject:

Maybe the Auto Revuenon 55mm f1.4.
While mine are not labelled MC, the coatings look multi coated to me.
Tom

D1N0 · Joined: 07 Aug 2012 Posts: 2491

This Porst seems the be Multi-coated and Cosina
http://m42lens.com/m42-lens-database/605-porst-color-reflex-mc-auto-55mm-f-1-4-16-v1

and here a Super Carenar: http://m42lens.com/m42-lens-database/1367-carenar-super-carenar-mc-55mm-f-1-4-16

Here is a post of a Tomioka made Multi coated Chinon and A single coated Cosina. https://www.pentaxuser.com/forum/topic/porst-and-cosina-55mm-f-1-4--m42--50205

The Cosina multi-coateds don't seem to have the distinctive green coating layer.

There is a lot of confusion on the Internet over what is Tomioka and what Cosina. The main difference in probably the aperture ring. Lenses with red diamond focus marks are probably always Tomioka. If it has a Lolipop it depends on the aperture ring. I think Cosina and Tomioka problaby coöperated. Their are Tomioka branded Cosinas. Probably Tomioka glass in a Cosina body.

aidaho · Joined: 29 Apr 2018 Posts: 456 Location: Ukraine

aidaho · Joined: 29 Apr 2018 Posts: 456 Location: Ukraine

aidaho · Joined: 29 Apr 2018 Posts: 456 Location: Ukraine

Oldhand · Posted: Thu Jun 04, 2020 11:14 am Post subject:

aidaho · Joined: 29 Apr 2018 Posts: 456 Location: Ukraine

D1N0 · Joined: 07 Aug 2012 Posts: 2491

Alex TG · Joined: 13 Oct 2019 Posts: 221 Location: Ukraine

papasito · Joined: 09 Jan 2015 Posts: 1658

kiddo · Joined: 29 Jun 2018 Posts: 1121

I've found a good SX 55mm 1.4 mamiya for good price , but already have sime other 1.4 , so I am wondering if this one would really be any different to Nikon, mamiya ef, FD SSC etc, not in sharpness but in character? The 135 SX is a very nice one and could pair it with the 55mm, of course is only an excuse ...

kymarto · Posted: Mon May 23, 2022 2:35 pm Post subject:

A note of 55mm f1.2 lenses. There are at least three that I know of. There is the famous M42 Tomioka, sold under the names (at least) Tominon, Yashinon, Cosinon. Then there is the Porst, also sold under several names. Then there is another Cosina lens, sold as Revuenon MC or Cosina MC, that was made in PK mount. The supposition was that this is also a Tomioka design. It can be identified by having a 58mm front filter ring, instead of the 55mm thread of the Porst. For me personally, this last one is the best of the lot. Here are some shots with that one
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iangreenhalgh1 · Expire: 2014-01-07

Wow, you're really applied a lot of processing to those images. That makes it impossible to tell much about the character of the lens you used.

kymarto · Posted: Mon May 23, 2022 8:52 pm Post subject:

D1N0 · Joined: 07 Aug 2012 Posts: 2491

Microcontrast has a lot of influence on bokeh as you can see in these images. I am not a fan of using it in images with a lot of OOF areas. When a lens is very sharp and contrasty by itself you can use it to smoothen busier bokeh a bit without loosing too much subject contrast. Enhanced definition in OOF areas just makes it grainy and busier.

kymarto · Posted: Mon May 23, 2022 9:56 pm Post subject:

Depends on one's taste, I'd say. My particular taste runs to really busy, nisen bokeh YMMV

iangreenhalgh1 · Expire: 2014-01-07

kymarto · Posted: Mon May 23, 2022 11:10 pm Post subject:

Oldhand · Posted: Mon May 23, 2022 11:28 pm Post subject:

Auto Revuenon 55mm f1.2

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iangreenhalgh1 · Expire: 2014-01-07