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Tamron sp 17mm 3.5 has unscrewed

The focus ring started to slip, and not move the barrel. In attempting to understand what was wrong with it I managed to unscrew the whole lens barrel from the focus ring (oops) mechanically sound. I just need to understand how to fit it all back together again. I now understand that all I need to have done was tighten the little screws under th erubber ring of the focus ring. Too late. The lens has a reverse screw, but I need to line up the aperture mechanism etc which is impossible if I'm screwing down onto it. A site with pictures would be ideal! Cheers, from a very upset wide angle fan.

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Re: Tamron sp 17mm 3.5 has unscrewed

It would be great to be able to see some les diagrams hey

Posted on May 22, 2008

Re: Tamron sp 17mm 3.5 has unscrewed

When disassembling the elicoids, one must care to procede very slowly and mark the points at which the parts separate. Then follow the reverse procedure. A good amount of mechanical skill is necessary.
This is the minimum requirement to avoid disaster.
The first time I attempted to disassemble the elicoids of a Zeiss Biotar, I took it apart in two minutes. To reassemble, four hours. Now I can do it in twenty minutes.

Posted on Mar 26, 2008

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Re: Tamron sp 17mm 3.5 has unscrewed

It might just be better to take this to somewhere like Jessops and see if they will do it for you..

Posted on Sep 27, 2007

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It is brand new Tamron 28-75 f2.8 for Sony mount. When it is focusing on an object and rotates from one end to the other velocity causing to shift image slightly in the direction of rotating AF ring....


You should turn the aperture ring on the lens toits smallest setting (largest f/number). If the ring has a lock, lock it inplace. You control the aperture from the camera body, just as you would on alens with no aperture ring.

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Where I can buy replacement parts (rubber zooming ring) for Tamron 17-50/2.8 SP lense?

Try their website and call them. I had some problems with my 28-300mm and I need some parts to replace. I called the customer service an there a very sweet lady sent me the diagram of my lens with all the parts codes. After I identified the needed parts I ordered them by mail to that lady. She provided me the prices and I agreed. I paid with the credit card and the lady shipped the right parts to me. Good luck.

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Hi, i have the Sigma 70-200mm for Canon EF and the manual focus don't work. The HSM works fine and focuses perfect, but if you choose MF, you can't rotate the focus-ring. Many greetings from Germany! Kai

Hi, not sure if you still have this issue. I have just decided to look into it again, as I had a lot of focus problems with my Sigma 70-200mm HSM lens. Since there is no Sigma support here in Beijing, I took a look - and fixed it.

Here is what I did: On the front of the lens barrel is the rubberised focus ring. This can be removed (gently ply it away from the barrel by sticking a flat bit (or plastic letter opener) between the barrel and the rubber grip. It will come not entirely loose, so you need to work your way around the lens. Keep doing that until you moved it about half way forward. At this point two fixing screws become accessible on the barrel below.

In my case, one of the screws had come loose and that blocked the focus ring from turning, as the screw was blocking rotation in the access hole on the barrel.

Hope this helps others. Simple to fix, if you know how.

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Maybe its something you're not doing, LOL.
Look on the side of the lens. Most of the 70-300 macros have a slide switch. My Tamron, for instance, needs to be zoomed out to 300, then slide the switch to Macro and its ok. Look for the slide switch. You might also notice lines of a different color to denote Macro.
Some days it too tough to be smarter than the lens,

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Hi, I have the same problem with the same lens. Did you fix it yet? Mine is the Tamron Aspherical LD XR Di II SP 17-50 f2.8. I'm thinking about getting the screwdrivers to it.

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I am using a Tamron AF 18 - 250 mm lens on a nikon d90 and some times on auto focus F---- is displayed and i cannot take a photo. Is this something to do with the match of lens to camera ?

Make sure the lens is set for the largest f number on the aperture ring. there may be a lock to prevent the ring from turning in the future. Locking the lens of the largest f number allow the camera to set the lens through the camera. This is normal on most of the newer cameras.

If the lens does not have a move-able aperture ring, then dismount and remount the lens, making sure the lens is completely mounted and locks into place, completely lining up the contacts inside. If this does not work The camera or lens may need servicing.

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you may find a good camera shop can help you get some replacments for it from there repair chapy,

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Sorry but if you've tried all the usual fixes then there's nothing more that you can do. Either pay for a professional repair or continue to use the lens manually.

A professional repairer should be able to indicate what the likely costs are going to be and you can then judge whether repairs are cost effective.

Personally, I'd stick to manual focus as I've always preferred knowing exactly what I'm focussing on instead of constantly fiddling with buttons and menus to override what the dumb camera has locked onto.

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