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jamesyboy
Joined: 09 Jan 2019 Posts: 4 Location: United Kingdom
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Posted: Wed Jan 16, 2019 2:16 pm Post subject: Pentax K mount to EOS help |
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jamesyboy wrote:
Just bought myself a Pentax SMC 1.7/50. I'm using it on a Canon 400D with a AF confirm adaptor. The problem I'm having is that the focus is out when the AF confirm beeps. It's usually focused behind the subject. I've tested a Vivitar zoom with the same set up and the AF is fine. I wondering if it's due to some tiny barely noticeable fungus in the Pentax lens. It's so small you can only see it if you shine a torch threw the lens. Could something so small throw the AF confirm out or is it something more terminal with the lens? Once I adjust the focus by eye it takes perfect sharp pictures.
Cheers guys. |
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marcusBMG
Joined: 07 Dec 2012 Posts: 1301 Location: Conwy N Wales
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Posted: Wed Jan 16, 2019 8:32 pm Post subject: |
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marcusBMG wrote:
On my pentax I have the option of fine tuning the focus accuracy (correcting for slight front or back focusing) - can you do that with your canon? _________________ pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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jamesyboy
Joined: 09 Jan 2019 Posts: 4 Location: United Kingdom
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Posted: Wed Jan 16, 2019 9:54 pm Post subject: |
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jamesyboy wrote:
marcusBMG wrote: |
On my pentax I have the option of fine tuning the focus accuracy (correcting for slight front or back focusing) - can you do that with your canon? |
Not that i know of. It would be a handy feature. |
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D1N0
Joined: 07 Aug 2012 Posts: 2483
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Posted: Wed Jan 16, 2019 10:11 pm Post subject: |
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D1N0 wrote:
The 400d cannot micro-adjust autofocus. It has no live view for accurate manual focussing. It has a dark pentamirror so using the viewfinder isn't ideal either. It is an almost 11 year old camera. Better invest in a newer camera. If you want to shoot legacy glass mirrorless is the way to go. _________________ pentaxian |
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kypfer
Joined: 27 Sep 2017 Posts: 513 Location: Jersey C.I.
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Posted: Wed Jan 16, 2019 10:22 pm Post subject: |
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kypfer wrote:
D1N0 wrote: |
... Better invest in a newer camera. If you want to shoot legacy glass mirrorless is the way to go. |
Indeed, a Pentax might be an option in this case |
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visualopsins
Joined: 05 Mar 2009 Posts: 10462 Location: California
Expire: 2021-06-22
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Posted: Wed Jan 16, 2019 11:51 pm Post subject: |
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visualopsins wrote:
You can try turning focus ring from infinity until AF beep, or, from too close until AF beep. One way or the other may give better consistent results.
You can focus by viewfinder, using the AF points to determine focus, or by eye. Note unless a fast focus screen is installed accurate focus by eye is impossible at apertures smaller than about f/2.8. _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
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
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
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
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