visualopsins
Joined: 05 Mar 2009
Posts: 10540
Location: California
Expire: 2025-04-11
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 Posted: Tue Jun 12, 2018 5:27 pm Post subject: |
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visualopsins wrote:
With 1mm extension, lens cannot focus to infinity.
For M42 Takumars:
15mm, I don't know.
17mm fisheye, EOS FF mirror clears.
20mm, EOS FF mirror hits when lens focus is set to infinity, sometimes.
24mm, EOS FF mirror hits.
28mm, ok.
35mm, ok.
50mm, EOS FF mirror hits when lens focus is set to infinity, sometimes.
No problem with longer focal lengths.
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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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Lightshow
Joined: 04 Nov 2011
Posts: 3669
Location: Calgary
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| Posted: Tue Jun 12, 2018 6:46 pm Post subject: Re: Takumar 18mm f11 |
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Lightshow wrote:
| noahwrote wrote: |
I recently picked up a Takumar 18mm f11 that had a small scratch on the front for $50 US. When I attach it to an M42-EF adapter, there is some metal sticking out the back that my Canon 6D mirror hits! So, I put a 1mm or so rubber spacer between the lens and the adapter and the mirror problem has been solved.
What affect will the increased 1mm flange distance do to the picture?
I noticed that the picture is much sharper at F32 than at F11. Is this due to the lens itself or the increased flange distance?
Oh and there is flare everywhere! I think this lens should be used for those ghosts in your house reality shows!
Noah |
Adding the 1mm gap is like turning the focus ring till the optics move 1mm, for a long FL lens, it won't effect it much because the lens moves like +2cm in it's focus travel, for an ultra wide lens, it's focus travel is less than 1cm, and a few don't even have a focus helicoid, like this Takumar fisheye, so wide open you'll loose infinity, this means you will have to stop down to increase the DOF and regain infinity.
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A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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