visualopsins
Joined: 05 Mar 2009
Posts: 10531
Location: California
Expire: 2025-04-11
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 Posted: Wed Nov 25, 2020 6:18 pm Post subject: |
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visualopsins wrote:
There are PK-EOS adapters which mount the lens rotated 90 degrees or so -- works for some K-mount lenses. However, since at infinity the mirror hits the M42 1:3.5/28mm Takumars, and the SMC Pentax K version share the same optical formula, suspect the same.
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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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DigiChromeEd
Joined: 29 Dec 2009
Posts: 3462
Location: Northern Ireland
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| Posted: Wed Nov 25, 2020 7:57 pm Post subject: |
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DigiChromeEd wrote:
| visualopsins wrote: |
| There are PK-EOS adapters which mount the lens rotated 90 degrees or so -- works for some K-mount lenses. However, since at infinity the mirror hits the M42 1:3.5/28mm Takumars, and the SMC Pentax K version share the same optical formula, suspect the same. |
Eugene, this is my problem. I don't want to cut off the flange and bend the actuator lever if at all possible.
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"I've got a Nikon camera, I like to take a photograph" - Paul Simon |
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55
Joined: 13 May 2013
Posts: 709
Location: U.S.
Expire: 2022-06-15
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| Posted: Thu Nov 26, 2020 6:32 pm Post subject: |
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55 wrote:
| DigiChromeEd wrote: |
. . .
I don't want to cut off the flange and bend the actuator lever if at all possible. |
Having owned several Pentak K lenses and a Canon 5D, I've run into the same issue. I've never owned a K 28mm f/3.5, but the Pentax K fast 50s I dabbled with didn't appear to have a simple way to non destructively disconnect the aperture lever.
As I recall, I went as far as removing the mount on some lenses but I was afraid to dig deeper. And I never tried bending the lever, but it appears that would require removing the rear baffle / dust seal or at least cutting or grinding down the lever shield.
I hope I'm wrong. It would be nice to know if there is a reasonably easy, reversible method. |
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