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awa54
Joined: 02 Jun 2018 Posts: 39 Location: VT, USA
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Posted: Sun Jun 03, 2018 5:13 pm Post subject: Tamron SP 300mm f5.6 questions |
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awa54 wrote:
Hello all,
I recently got on an Adaptall kick and the 135 f2.5 and 200 f3.5 have impressed me enough that I figured I ought to get the 300 5.6 SP as well.... It hasn't worked out quite like I imagined
The lens is in very nice shape, with extremely clean glass (just a few dust specks) and seemingly flawless focus and aperture function.
I'm using these lenses on a Sony a900, so FF and 24MP, a moderately demanding sensor, which can show up shortcomings in glass that smaller sensors might gloss over.
So far, I have had issues with the lens producing drastic overexposure with in-camera (stop-down) metering and have also had very odd results with sharpness being hit-or miss, even when shot off a tripod with mirror lockup. The a900 has a big and acute enough viewfinder that it shouldn't be the issue, especially since I have been hitting critical focus with the 200mm no problem.
Any experienced users of this lens with suggestions on how to get the best out of this lens, or what might be going wrong here?
Thanks! _________________ Mostly Minolta (Sony) but Bronica too
https://www.flickr.com/photos/awa54/
Flickr Tamron 04B 200mm f/3.5 close focus group
https://www.flickr.com/groups/3139513@N20/
Flickr Tamron 54B SP 300mm f/5.6 tele macro group
https://www.flickr.com/groups/3051622@N20/ |
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visualopsins
Joined: 05 Mar 2009 Posts: 10427 Location: California
Expire: 2021-06-22
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Posted: Wed Jun 13, 2018 7:20 pm Post subject: |
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visualopsins wrote:
Try again!
Let us know if problems continue. _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ 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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awa54
Joined: 02 Jun 2018 Posts: 39 Location: VT, USA
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Posted: Wed Jun 13, 2018 8:02 pm Post subject: |
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awa54 wrote:
OK, so I am still getting fairly consistent 1 stop overexposures and metering also seems to be a bit fussier with this lens in place than with other long lenses I own (Tamron 200mm, Tamron 200-400, Minolta 100-200, Minolta 100-300 APO, Sigma 300 macro). There doesn't seem to be a problem with the aperture mechanics, and I'm shooting old-school stop-down aperture priority, which yields good exposures on all my other vintage glass.
As far as sharpness, there really seems to be a very narrow window where tack sharp images can be had, even very high shutter speeds often give soft results compared to the other 300mm optics in my collection, whereas hand held shots with the Tamron 200mm f3.5 close focus give excellent sharpness even close to reciprocal value shutter speeds...
If none of you have ever had any of these issues, I'll just have to assume that either this lens hates the a900 or I got a bad copy. _________________ Mostly Minolta (Sony) but Bronica too
https://www.flickr.com/photos/awa54/
Flickr Tamron 04B 200mm f/3.5 close focus group
https://www.flickr.com/groups/3139513@N20/
Flickr Tamron 54B SP 300mm f/5.6 tele macro group
https://www.flickr.com/groups/3051622@N20/ |
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kypfer
Joined: 27 Sep 2017 Posts: 511 Location: Jersey C.I.
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Posted: Tue Jul 03, 2018 7:17 am Post subject: |
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kypfer wrote:
awa54 wrote: |
OK, so I am still getting fairly consistent 1 stop overexposures and metering also seems to be a bit fussier with this lens in place than with other long lenses I own (Tamron 200mm, Tamron 200-400, Minolta 100-200, Minolta 100-300 APO, Sigma 300 macro). There doesn't seem to be a problem with the aperture mechanics, and I'm shooting old-school stop-down aperture priority, which yields good exposures on all my other vintage glass.
As far as sharpness, there really seems to be a very narrow window where tack sharp images can be had, even very high shutter speeds often give soft results compared to the other 300mm optics in my collection, whereas hand held shots with the Tamron 200mm f3.5 close focus give excellent sharpness even close to reciprocal value shutter speeds...
If none of you have ever had any of these issues, I'll just have to assume that either this lens hates the a900 or I got a bad copy. |
I realise that my experiences may not apply directly to your camera/lens combinations, but they may give a little food for thought.
I use a few Tamron Adaptall lenses on my Pentaxes and have found that the several slightly differing types of Adaptall and Adaptall-II PK mounts can give differing results on different lenses, the only fully reliable mount for anything other than fully manual metering being the late model mount designed for auto-aperture metering.
Just wondering whether it's a mount/adaptor combination that's causing you problems rather than the lenses themselves.
I don't have the 300mm f/5.6 (unfortunately) but my 135mm f/2.5, 200mm f/3.5, 500mm f/8 mirror (and a few others) can all be encouraged to "behave themselves" when fitted with an Adaptall-II mount that the camera is "happy with". |
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awa54
Joined: 02 Jun 2018 Posts: 39 Location: VT, USA
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Posted: Tue Jul 03, 2018 12:40 pm Post subject: |
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awa54 wrote:
There are no lens to camera interactions with the Adaptall to A-mount interface, so it's strictly stop-down metering.
Since the OP I have had similar issues with several other Adaptall lenses, it seems that there is some sort of optical artifact in these lenses that causes the Sony JPEG engine to over compress dynamic range causing what look like over exposed images. The solution is to turn off DRO and to use a "creative style" that doesn't decrease contrast (I usually use "portrait" which lowers contrast slightly as well as altering color rendering) .
Interestingly, there are a number of Adaptall lenses that cause no issues with these settings and produce JPEGs that reflect the content of the RAW files faithfully, but a few trigger the JPEG engine to make poor processing decisions, leading to the issues I have been experiencing.
The fact that the RAW files don't show any unusual optical flaws, like extreme flare or an obvious sensor to rear element reflection, makes understanding the cause for this quirk even more baffling, despite now knowing how to fix it. _________________ Mostly Minolta (Sony) but Bronica too
https://www.flickr.com/photos/awa54/
Flickr Tamron 04B 200mm f/3.5 close focus group
https://www.flickr.com/groups/3139513@N20/
Flickr Tamron 54B SP 300mm f/5.6 tele macro group
https://www.flickr.com/groups/3051622@N20/ |
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marcusBMG
Joined: 07 Dec 2012 Posts: 1299 Location: Conwy N Wales
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Posted: Mon Feb 04, 2019 4:50 pm Post subject: |
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marcusBMG wrote:
(belatedly picking up on this topic)
Interesting to hear about the issues you've had with the 54B awa54. Personally I have found that lens pretty reliable in terms of exposure results on Pentax (K5, K3). But as a general theme, yeah I have experienced exposure inconsistency with adaptalls.
I wrote about the PKA mounts specifically on pentax forums.
Part 1
part 2
Part 3
(Unfortunately pics are missing - haven't got round to replacing them). _________________ 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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