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benadamx
Joined: 25 Feb 2019 Posts: 329
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Posted: Thu Jun 20, 2019 4:27 am Post subject: tamron adaptall-2 sp 90mm won't focus to infinity? |
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benadamx wrote:
folks,
i have just come upon a tamron adaptall-2 sp 90mm f/2.5 macro 52b in what seems to me to be nice, unmolested condition.. however, in attempting to use it, adapted to my a7ii, i find that i can not focus to infinity - in fact, i can't focus much more than 5' or so.
the lens came with an adaptall-2 mount for pentax k/a, which i am then adapting to e-mount with the appropriate pk-to-nex adapter.. are there known issues with this configuration? do i need a shorter adapter? |
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benadamx
Joined: 25 Feb 2019 Posts: 329
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Posted: Thu Jun 20, 2019 4:31 am Post subject: |
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benadamx wrote:
i've also just now discovered that direct adaptall-to-nex adapters exist, and have ordered one, so perhaps that will address the issue. |
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kypfer
Joined: 27 Sep 2017 Posts: 520 Location: Jersey C.I.
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Posted: Thu Jun 20, 2019 5:40 am Post subject: |
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kypfer wrote:
You don't, by any chance, have an extension ring between the lens and the PK adaptor? One of the 90mm Tamrons was supplied with an Adaptall extension tube (or maybe it was an option), that might give the symptoms you describe Alternatively, there's not a close-up lens on the front? |
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benadamx
Joined: 25 Feb 2019 Posts: 329
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Posted: Thu Jun 20, 2019 6:27 am Post subject: |
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benadamx wrote:
kypfer wrote: |
You don't, by any chance, have an extension ring between the lens and the PK adaptor? One of the 90mm Tamrons was supplied with an Adaptall extension tube (or maybe it was an option), that might give the symptoms you describe Alternatively, there's not a close-up lens on the front? |
just checked for both just to be sure, but nope.. i suspect my PK adapter may be having a bad interaction with the adaptall K/A mount, just enough so to bollocks the infinity focus which is apparently extremely short on this lens - the all-in-one adapter on order appears (to my eye) to be at least a millimeter shorter at the shoulder than these two adapters put together, knock wood that solves the problem.. adapter should arrive in a few days, we shall see. |
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e6filmuser
Joined: 12 Nov 2010 Posts: 597 Location: Reading UK
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Posted: Thu Jun 20, 2019 9:50 am Post subject: |
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e6filmuser wrote:
It looks like the KA mount is not for the K series but for the A series Pentax.
https://www.mosphotos.com/PentaxLensesExplained.html
Could that mean you have the wrong adapter.
I haven't studies the details on the above link. _________________ Dedicated to using manual focus lenses with digital. Equiped for photography from macro to panoramic & from ultra-wide to extreme telephoto. Mostly shooting outdoor macro. Experienced entomological taxonomist. Some knowledge of mushrooms. |
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visualopsins
Joined: 05 Mar 2009 Posts: 10568 Location: California
Expire: 2025-04-11
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Posted: Thu Jun 20, 2019 11:12 am Post subject: |
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visualopsins wrote:
From https://www.mosphotos.com/PentaxLensesExplained.html
Quote: |
A, F, FA and D FA lenses work on all Pentax bayonet cameras ever produced. Exceptions: 1) A lenses do not work on the MZ-60/ZX-60, 2) the D FA 100mm F2.8 WR and newer D FA lenses have no aperture ring which restricts their use on some film cameras. |
and 1mm extension isn't enough to make that lens focus that close only.
My guess is lens has issue. How do those images made closer than 5 feet look? If okay, then likely helical might need restarting. Otherwise an element may have dislodged or be flipped.
Please let us know how new adapter works! _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ 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 (151B), 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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marcusBMG
Joined: 07 Dec 2012 Posts: 1305 Location: Conwy N Wales
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Posted: Thu Jun 20, 2019 11:59 am Post subject: |
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marcusBMG wrote:
When focusing to infinity the front end should retract and end up completely flush with the focus barrel. is this the case?
And does the lens seem to perform correctly optically? _________________ 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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kypfer
Joined: 27 Sep 2017 Posts: 520 Location: Jersey C.I.
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Posted: Thu Jun 20, 2019 3:25 pm Post subject: |
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kypfer wrote:
benadamx wrote: |
i suspect my PK adapter may be having a bad interaction with the adaptall K/A mount, just enough so to bollocks the infinity focus which is apparently extremely short on this lens - the all-in-one adapter on order appears (to my eye) to be at least a millimeter shorter at the shoulder than these two adapters put together, knock wood that solves the problem.. adapter should arrive in a few days, we shall see. |
I regularly use my 90mm Tamron Adaptall-2 fitted with the PK/A adaptor on my Pentax DSLR's with no problem. Have you tried any other PK-fit lenses on your a7ii with the adaptor?
5ft maximum focus distance seems like a ridiculously close distance for a badly made adaptor. I had a PK adaptor for my Samsung which would only focus out to about 40ft, that was about 1mm too big, to come into 5ft maximum focus distance I need about an 8-10mm tube with the Tamron 90mm set to infinity.
Unfortunately it really does sound like there's something wrong with your lens |
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kypfer
Joined: 27 Sep 2017 Posts: 520 Location: Jersey C.I.
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Posted: Thu Jun 20, 2019 3:38 pm Post subject: |
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kypfer wrote:
The Tamron PK/A is perfectly backward compatible with the PK mount, the only practical difference is the addition of a set of electrical contacts so a suitably equipped Pentax camera can "read" the aperture information from the lens and display appropriate exposure information. When used in conjunction with any third-party adaptor for use with a non-Pentax camera these contacts are redundant.
Indeed, if the OP so wished, he might profit from selling the desirable PK/A Adaptall-2 mount and replacing it with a much cheaper P/K mount, or indeed the third-party Tamron-NEX adaptor he has on order |
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benadamx
Joined: 25 Feb 2019 Posts: 329
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Posted: Thu Jun 20, 2019 5:19 pm Post subject: |
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benadamx wrote:
marcusBMG wrote: |
When focusing to infinity the front end should retract and end up completely flush with the focus barrel. is this the case?
And does the lens seem to perform correctly optically? |
yeah these details both seem to be fine otherwise, took some very nice close-up portrait and macro shots with it, guess i may yet need to open it up and see what's going on with the helicoid |
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benadamx
Joined: 25 Feb 2019 Posts: 329
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Posted: Thu Jun 20, 2019 5:21 pm Post subject: |
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benadamx wrote:
kypfer wrote: |
I regularly use my 90mm Tamron Adaptall-2 fitted with the PK/A adaptor on my Pentax DSLR's with no problem. Have you tried any other PK-fit lenses on your a7ii with the adaptor? |
i have a few other PK lenses that have been fine with the PK adapter, makes me think something is weird with the K/A adaptall-2 adapter, but indeed it may well be the lens itself, will find out tomorrow |
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Mike Deep
Joined: 25 Oct 2008 Posts: 316 Location: Upstate New York
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Posted: Thu Jun 20, 2019 9:39 pm Post subject: |
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Mike Deep wrote:
Post some pictures of the lens. _________________ Rocket Launch Photography
Olympus: 24/2.8 MC, 28/3.5, 28/2.8 MC, 35/2.8, 50/3.5, 50/1.8, 50/1.4 MC, 35-70/3.6, 75-150/4
Nikon: C 24/2.8, AI-S 28/2.8, K 35/2.8, F 55/3.5, F 105/2.5, F 135/2.8, F 200/4, No. 5T
Pentax: 28/3.5, 35/3.5, 50/1.4 (v1), 50/1.4 (v2), M 50/1.4, SMC 55/1.8, 105/2.8, SMC 135/3.5, 150/4
Tamron: SP 17/3.5 151B, 135/2.8 T-135, SP 300/2.8 60B, SP 35-80/2.8-3.8 01A, 80-210/3.8-4 103A, SP 1.4x TC 140F, SP 2x TC 01F
Vivitar: 24/2 (Kino), 28/2 (Kino), 50/1.4 (Cosina), S1 90/2.5 (Tokina), S1 28-80/2.8-3.5 (Kino), 70-150/3.8 (Kino), S1 70-210/3.5 (Kino), 2x Macro TC
Etc: Yashica 3.5cm/2.8, Fujinon 50/1.4, Yashica ML 50/1.4, Tomioka Yashinon 55/1.2, Mamiya/Sekor 55/1.7, Sigma 90/2.8
That's a lot of 50s. |
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marcusBMG
Joined: 07 Dec 2012 Posts: 1305 Location: Conwy N Wales
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Posted: Thu Jun 20, 2019 10:39 pm Post subject: |
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marcusBMG wrote:
The helical movement to go from infinity focus to 5m is very small, maybe 5° rotation. On my 52B it extends the barrel barely a mm from the front. So it doesn't take much to cause this problem, however it is a bit inexplicable. I would actually expect an incorrect reassembly of the helicoid to cause more than this... I haven't had one of these lenses apart but there might be say 4 positions to re-engage the thread ie ~ 90° apart which if it causes a loss of infinity focus would be relative to this displacement.
The focus on this lens is not simple extension of the lens away from the camera, the rear group is fixed. A small discrepancy in a mount or adapters is likely to be barely noticeable in terms of missing infinity focus - mmm perhaps I should test this, I'll try mine with an M42 mount plus flanged M42 to PK adapter on my pentax tomorrow.
I take it the infinity mark on the distance scale seems to line up correctly? _________________ 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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benadamx
Joined: 25 Feb 2019 Posts: 329
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Posted: Fri Jun 21, 2019 5:05 am Post subject: |
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benadamx wrote:
here are some photos of the situation, as well as a photo of my wife and son taken with the lens at pretty close to the current focal range limit.. it really does feel like gaining a millimeter or two could make the difference, we shall see
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benadamx
Joined: 25 Feb 2019 Posts: 329
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Posted: Fri Jun 21, 2019 5:11 am Post subject: |
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benadamx wrote:
just for sake of comparison, here's the combo adapter i ordered
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vivaldibow
Joined: 23 Jun 2018 Posts: 837
Expire: 2021-03-09
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Posted: Fri Jun 21, 2019 5:16 am Post subject: Re: tamron adaptall-2 sp 90mm won't focus to infinity? |
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vivaldibow wrote:
benadamx wrote: |
folks,
i have just come upon a tamron adaptall-2 sp 90mm f/2.5 macro 52b in what seems to me to be nice, unmolested condition.. however, in attempting to use it, adapted to my a7ii, i find that i can not focus to infinity - in fact, i can't focus much more than 5' or so.
the lens came with an adaptall-2 mount for pentax k/a, which i am then adapting to e-mount with the appropriate pk-to-nex adapter.. are there known issues with this configuration? do i need a shorter adapter? |
Hmm, let's my try it on mine some day. I do notice for my Vivitar 35mm f/1.9 N/AI mount, I can focus beyond infinity. Or I should say, when an object at infinite distance is in focus, the actual focusing distance on the lens doesn't reach infinity yet. Haven't figured out why. |
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benadamx
Joined: 25 Feb 2019 Posts: 329
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Posted: Fri Jun 21, 2019 5:19 am Post subject: |
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benadamx wrote:
folks, i am an idiot! it's not a KA adapter, it's a Konica-AR adapter! i switched adapters and it works fine now!!
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visualopsins
Joined: 05 Mar 2009 Posts: 10568 Location: California
Expire: 2025-04-11
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Posted: Fri Jun 21, 2019 10:48 am Post subject: |
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visualopsins wrote:
How's the throw from 5 FEET to infinity? _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ 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 (151B), 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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marcusBMG
Joined: 07 Dec 2012 Posts: 1305 Location: Conwy N Wales
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Posted: Fri Jun 21, 2019 12:11 pm Post subject: |
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marcusBMG wrote:
I was going to ask how did the konica mount connect to the PK adapter, but I have just tried a konica TX mount I acquired with a vivitar 400mm with a PK-NX (samsung) adapter. It does engage pretty well.
So that explains it. I was looking at your pics and noticed the K/R on the mount and I was thinking "hang on..." The adaptall K/R mount is nothing like a PKA, its a lot thicker and doesn't have contacts. And that's your loss I'm afraid the konica mount is near worthless.. _________________ 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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kypfer
Joined: 27 Sep 2017 Posts: 520 Location: Jersey C.I.
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Posted: Fri Jun 21, 2019 1:05 pm Post subject: |
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kypfer wrote:
benadamx wrote: |
folks, i am an idiot! it's not a KA adapter, it's a Konica-AR adapter! i switched adapters and it works fine now!! |
That would have fooled me! I'd have assumed it was a "K-Ricoh" adaptor, not a "Konica-R" ... would have been running around in circles just like you!
I've just tried a Konica lens on my Pentax DSLR and it simply doesn't fit to any degree, but trying the lens in a PK-NX adaptor does work to a point, so, as I think we're probably aware, a lot of the available adaptors are not manufactured to particularly tight tolerances
Just a note about the Tamron 52B I remembered when i was using mine this morning ... if you fit a rubber lens hood, it may well foul the lens body and prevent infinity focus. I've "extended" the thread on mine with a glassless filter ring so the rubber is held clear of the lens body at infinity. This is probably less of a problem with a rigid lens hood.
Enjoy ... it's a great lens |
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aidaho
Joined: 29 Apr 2018 Posts: 456 Location: Ukraine
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Posted: Fri Jun 21, 2019 1:38 pm Post subject: |
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aidaho wrote:
marcusBMG wrote: |
I was going to ask how did the konica mount connect to the PK adapter, but I have just tried a konica TX mount I acquired with a vivitar 400mm with a PK-NX (samsung) adapter. It does engage pretty well. |
If you are out of the OM lens caps, take one for PK mount.
It fits perfectly.
(however OM lens won't lock on PK adapter, I've already tried that) _________________ https://www.flickr.com/photos/curry-hexagon/ |
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marcusBMG
Joined: 07 Dec 2012 Posts: 1305 Location: Conwy N Wales
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Posted: Fri Jun 21, 2019 1:59 pm Post subject: |
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marcusBMG wrote:
OM, PK, CY are all very similar in bayonet dimensions, that's why the "multimount" that you can get for a pentax dslr works. An old style nikon F (no protruding "AI" connections) can usually actually be squeezed onto a pentax camera (usually upsidedown). I've also been using my PK-NX adapter with an OM mount lens. _________________ 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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DConvert
Joined: 12 Jun 2010 Posts: 905 Location: Essex UK
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Posted: Fri Jun 21, 2019 8:59 pm Post subject: |
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DConvert wrote:
benadamx wrote: |
folks, i am an idiot! it's not a KA adapter, it's a Konica-AR adapter! i switched adapters and it works fine now!!
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Glad it's sorted.
The line for the focus distance being so far off center should have given a clue, but I was too busy looking for the matched 1:1 adapter to notice that. |
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