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03-06-2020, 06:13 PM   #16
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QuoteOriginally posted by stevebrot Quote
I need to start a list of these sort of things to add to an article on adapted M42 lenses that has been simmering on the back burner for quite a while.


Steve
I was quite surprised when the Schneider Kreuznach edixa tele xenon 135mm fouled. That must have been more down to the threads. I don't remember it protruding. I will test all my other M42s in the morning. I know my takumars are fine and I used my 58 Zeiss tessar in a sic and that is fine too. It may well just be the variants of the DX. I can't test the Schneider, it went to a new home some months ago. It was a shame but I have other lenses that are trouble free.

03-06-2020, 08:23 PM   #17
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I just tested my Auto-Rikenon 50/1.7 adapted to my Pentax Super Program and there is mirror interference when focused to infinity with the Pentax genuine adapter.

Ricoh Auto-Rikenon 50mm f/1.7 (m-42) Lens Reviews - Ricoh Lenses - Pentax Lens Review Database


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03-07-2020, 02:07 AM   #18
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QuoteOriginally posted by stevebrot Quote
I just tested my Auto-Rikenon 50/1.7 adapted to my Pentax Super Program and there is mirror interference when focused to infinity with the Pentax genuine adapter.

Ricoh Auto-Rikenon 50mm f/1.7 (m-42) Lens Reviews - Ricoh Lenses - Pentax Lens Review Database


Steve
That is such a shame. The Auto 55mm look very similar, protrude a similar amount but don't interfere with the mirror. We must be talking really fine margins. The review says it is a tokina, my understanding is that it is a tomioka. It probably is a tokina. Its amazing just how many lenses are falsely attributed to tomioka. So many false claims I am beginning to wonder if tomioka is mythical like a photographic unicorn
03-07-2020, 02:41 PM - 1 Like   #19
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QuoteOriginally posted by Cerebum Quote
So many false claims I am beginning to wonder if tomioka is mythical like a photographic unicorn
The lens maker is definitely real, though their role as OEM producer of SLR lenses under multiple brands is harder to confirm. What is known is that they were owned by Yashica from 1968 and made Yashinon-labeled lenses and rumored to have made a broad range of product for other camera companies through much of the 1960s into the 1970s.

The relationship between various fast 50s in M42 mount is fairly easy to establish on teardown (identical optics), but often other factors (grips, size, focal/aperture combinations, etc.) are given unreasonable weight. A good example might be the common assertion that Mamiya/Sekor SLR lenses were made by Tomioka, despite M/S being a major lens maker in their own right.* An association with various M42 Rikenon SLR lenses is well-established, but not for all models. A similar situation exists for Chinon and several other minor makers.

Tomioka - Camera-wiki.org - The free camera encyclopedia


Steve

* I confirmed this by personal discussion with a former Mamiya/Sekor employee who did work on my 1000 DTL.


Last edited by stevebrot; 03-07-2020 at 02:52 PM.
03-07-2020, 02:44 PM   #20
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QuoteOriginally posted by Cerebum Quote
I was quite surprised when the Schneider Kreuznach edixa tele xenon 135mm fouled.
Does this lens have a narrow flange such that it does not engage the K-mount when adapted? That might provide an explanation.


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03-07-2020, 03:08 PM   #21
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I have a tele-xenar 135/3.5 -- it doesn't protrude much, can't imagine it being a problem. Will have to test that one. One thing about m42s is that they are sometimes used-adjusted to change infinity settings when people adapt them to things they don't adapt well too -- is it possible to adjust a lens so it protrudes farther than it once did?
03-07-2020, 04:20 PM   #22
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QuoteOriginally posted by stevebrot Quote
Does this lens have a narrow flange such that it does not engage the K-mount when adapted? That might provide an explanation.


Steve
Dunno, I don't have it any more. It was F4 and, whilst being a very pretty and capable thing, I had others I preferred
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