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kypfer
Joined: 27 Sep 2017 Posts: 513 Location: Jersey C.I.
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Posted: Fri Jan 25, 2019 6:17 pm Post subject: Tamron Twin-Tele disassembly problems |
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kypfer wrote:
I recently acquired, at a very reasonable price, a Tamron Twin-Tele f/4.5-7.7 (135/225mm), complete in it's case with mounts for M42 and Exacta, but unfortunately the lens focus is completely seized at infinity. I've removed the shrouds to expose the brass focussing "nut" on the aluminium 12-start helix, but just can't get it to budge.
I've soaked the assembly carefully but thoroughly with penetrating lubricant over several days with no effect. I'm obviously loathe to go at it with hammers and wrenches or other "instruments of destruction" for fear of damaging the threads, so would appreciate the benefit of anyone else's experience in freeing off assemblies like this.
The lens itself is attractively small for a 135mm and the 13-blade pre-set aperture holds promise for some interesting out-of-focus effects, but being able to focus it elsewhere than infinity without using extension tubes would be a bonus
Thanks for any insights
Last edited by kypfer on Fri Jan 25, 2019 6:37 pm; edited 1 time in total |
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fiftyonepointsix
Joined: 30 Apr 2017 Posts: 292
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Posted: Fri Jan 25, 2019 6:25 pm Post subject: |
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fiftyonepointsix wrote:
I'm assuming that you've removed the glass from the focus mechanism that is seized up.
I've soaked focus mounts in acetone for a week, taking out every day and putting some pressure on the mechanism before it finally freed up. Simlar 5cm F1.5, J-3's, J-8's, etc. The old grease gets like glue. |
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kypfer
Joined: 27 Sep 2017 Posts: 513 Location: Jersey C.I.
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Posted: Fri Jan 25, 2019 6:42 pm Post subject: |
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kypfer wrote:
fiftyonepointsix wrote: |
I'm assuming that you've removed the glass from the focus mechanism that is seized up.
I've soaked focus mounts in acetone for a week, taking out every day and putting some pressure on the mechanism before it finally freed up. Simlar 5cm F1.5, J-3's, J-8's, etc. The old grease gets like glue. |
I've not removed the glass yet, though I don't anticipate that to be a problem, I do have a lens wrench.
I also have most of a pint of acetone in the cupboard, so that'll be my next approach. I'll probably take the lens out with some extension tubes for a bit of a "play" before I totally disassemble it, just in case I have an accident.
Thanks |
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visualopsins
Joined: 05 Mar 2009 Posts: 10462 Location: California
Expire: 2021-06-22
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Posted: Fri Jan 25, 2019 6:44 pm Post subject: |
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visualopsins wrote:
"Penetrating lubricant" sounds suspiciously like WD40 which is for water displacement and lubrication not penetration. Neat wintergreen oil is a fantastic penetrating oil, the secret ingredient of commercial true penetrating oils like Marvel Mystery Oil or Liquid Wrench brands. Effective for corrosion too.
Apply heat and cold to expand and contract metal maybe free it. Heat gun, freezer.
A light tap on either end of the barrel parts may free a jam.
Acetone mentioned above should dissolve any solidified grease, etc..
Edit: remove the glass & diaphragm to prevent damage to those parts! _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ 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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kypfer
Joined: 27 Sep 2017 Posts: 513 Location: Jersey C.I.
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Posted: Mon Feb 18, 2019 7:44 pm Post subject: |
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kypfer wrote:
Many thanks for the recommendations.
Having removed the glass, the barrel has been soaked in acetone for several days, intermittently subjecting it to as much twisting I could apply. A third application of boiling water from the kettle (whilst wearing rubber gloves) finally got everything moving
I'll now spend some time cleaning out the residue, before re-greasing and reassembling and taking it out to play
Thanks again, one and all |
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Alun Thomas
Joined: 20 Aug 2018 Posts: 614 Location: New Zealand
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Posted: Tue Feb 19, 2019 4:48 am Post subject: |
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Alun Thomas wrote:
Nice, I was about to recommend a wee bit of heat, grease normally softens up naturally with it. Was it easy to get the glass out? I have a Soligor badged version which needs cleaning, fortunately the focus is all functional. |
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kypfer
Joined: 27 Sep 2017 Posts: 513 Location: Jersey C.I.
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Posted: Tue Feb 19, 2019 8:03 am Post subject: |
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kypfer wrote:
Alun Thomas wrote: |
Nice, I was about to recommend a wee bit of heat, grease normally softens up naturally with it. Was it easy to get the glass out? I have a Soligor badged version which needs cleaning, fortunately the focus is all functional. |
Initial applications of heat hadn't appeared to have any affect, so I soldiered on and prayed a bit to the big god ASA-ISO in the clouds
The front lens just dropped out once the retaining collar was unscrewed. There's two little slots for a lens wrench on my Tamron, so no problem at all. Similarly the rear group just unscrewed with the wrench. I didn't remove the aperture mechanism, it seemed I had to remove the focus "nut" to enable that to happen so I set it wide open and worked carefully ... I seem to have succeeded |
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Lloydy
Joined: 02 Sep 2009 Posts: 7775 Location: Ironbridge. UK.
Expire: 2022-01-01
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Posted: Tue Feb 19, 2019 3:07 pm Post subject: |
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Lloydy wrote:
It's a great lens and well worth saving.
I have boiled lenses in a pan on the stove before now to get old and solid grease out of a lens. Of course I remove all the glass first, but I have boiled at least one with the aperture blades in place. I usually follow a boiling with a session of simmering just below boiling with a strong mix of water soluble de greaser such as Jizer which doesn't attack paint, plastic or alluminium.
https://www.amazon.co.uk/Swarfega-Jizer-5-Litre/dp/B006CLFE98
I've never boiled newer lenses with plastic parts though, maybe that's not such a good idea?
( I also have a nice copy of this Twin Tele lens for sale ) _________________ LENSES & CAMERAS FOR SALE.....
I have loads of stuff that I have to get rid of, if you see me commenting about something I have got and you want one, ask me.
My Flickr https://www.flickr.com/photos/mudplugga/
My ipernity -
http://www.ipernity.com/home/294337 |
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kypfer
Joined: 27 Sep 2017 Posts: 513 Location: Jersey C.I.
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Posted: Tue Feb 19, 2019 3:33 pm Post subject: |
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kypfer wrote:
Lloydy wrote: |
It's a great lens and well worth saving.
I have boiled lenses in a pan on the stove before now to get old and solid grease out of a lens. Of course I remove all the glass first, but I have boiled at least one with the aperture blades in place. I usually follow a boiling with a session of simmering just below boiling with a strong mix of water soluble de greaser such as Jizer which doesn't attack paint, plastic or aluminium.
I've never boiled newer lenses with plastic parts though, maybe that's not such a good idea?
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Ha ha !
I'm very familiar with Jizer, but thanks for the suggestion, someone else may benefit from it
Here's a quick shot comparing the Tamron with some other 135mm f/4 solutions. The Tamron on the left, a Retina Tele-Xenon on a DKL-PK mount in the middle and a recently acquired ISCO Isconar - surprisingly different and the Tamron is half the weight of the Tele-Xenar!
I'll be taking them all out soon for a comparative session, the Xenar is going to be a hard act to follow!
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