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heresiarch
Joined: 08 Jun 2016
Posts: 15
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 Posted: Fri Jul 06, 2018 8:42 pm Post subject: Yashinon DX 2,8/28 M42 mount problem |
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heresiarch wrote:
Hello,
I bought this M42 Auto Yashinon for cheap. I didn't even think about trying it first. It is a m42 mount but somehow it doesn't screw all the way, as you can see from the pictures with lens mounted on my 77D. Of course, reaching infinity is impossible. I have other m42 lenses, even a Yashinon 1,4/50 that work with this adapter just fine.
Has anyone encountered this problem? Any ideas how to solve this are welcome.
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visualopsins
Joined: 05 Mar 2009
Posts: 10524
Location: California
Expire: 2025-04-11
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| Posted: Fri Jul 06, 2018 9:21 pm Post subject: |
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visualopsins wrote:
Sounds like lens is T-mount -- same thread diameter as M42, but different threads-per-millimeter.
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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kypfer
Joined: 27 Sep 2017
Posts: 514
Location: Jersey C.I.
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| Posted: Fri Jul 06, 2018 9:27 pm Post subject: |
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kypfer wrote:
I'm not familiar with this particular lens, but just wondering if there's some kind of aperture sensing "lug", as used on Fujica screw cameras, that's causing the problem.
I've got several Fujica lenses, having used that system back in the 70's, and have taken a file to all of them so's I can continue to benefit from my investments.
Without removing the "lug" on the back of the aperture ring, the Fujica lenses won't screw completely home on a "conventional" 42-screw camera, the net result being an "off-centre" lens and an aperture ring that won't turn.
It's obviously not a T2 lens, the aperture pin is a giveaway ... and is that an "auto/manual" switch just visible?
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heresiarch
Joined: 08 Jun 2016
Posts: 15
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| Posted: Fri Jul 06, 2018 10:20 pm Post subject: |
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heresiarch wrote:
Did it!
The solution was far more simple than I imagined.
I just removed the base ring to find a little spring lodged there causing the ring to be few millimeters closer to the lens mount, thus preventing the lens from screwing all the way. Who and why someone left it there is a mystery. I doubt anyone else will encounter this exact situation but I am posting the answer, anyway.
Thanks for all replies, this forum is one of nicest communities on the net.
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visualopsins
Joined: 05 Mar 2009
Posts: 10524
Location: California
Expire: 2025-04-11
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| Posted: Fri Jul 06, 2018 11:06 pm Post subject: |
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visualopsins wrote:
 
Looks like an aperture-ring spring. Pushes a ball bearing against the lens body. The body has detentions to catch the ball. The detentions are placed so the aperture ring is held in place. The aperture ring clicks.
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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heresiarch
Joined: 08 Jun 2016
Posts: 15
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| Posted: Sat Jul 07, 2018 8:24 am Post subject: |
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heresiarch wrote:
| visualopsins wrote: |
Looks like an aperture-ring spring. Pushes a ball bearing against the lens body. The body has detentions to catch the ball. The detentions are placed so the aperture ring is held in place. The aperture ring clicks. |
You are probably right, now when I think about it that way. The ball bearing is long gone, though. The lens is now declicked properly and focuses to infinity.
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Eddie46
Joined: 05 Dec 2016
Posts: 135
Location: cardiff,UK
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| Posted: Sat Jul 07, 2018 8:47 pm Post subject: |
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Eddie46 wrote:
Same story with my 50mm f1.7 DSM Yashinon. Ball and spring just refused to stay put. Such a pain to get at too,top down deconstruction all the way,no 'back door'! |
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