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Tamron 28-75 focus ring fell off!


joora 1 2
27 Nov 2012 11:37AM
Hello,

I'm a proud owner of the Tamron 28-75 for EF mount and I have a tricky problem - the plastic focus ring decided to detach from the rest of the lens!

The lens is not under warranty, so I believe that sending it to repair would be expensive.

Now, if anyone could help me, I would apprechiate it - as far as I've noticed the focus ring is glued to the metal part of the lens. Are there any more (fixed) contacts that broke, or is it just the glue decided to call it a day?

If it's only glue, what type of glue would you reccomend for the repair job?

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mikehit e2
5 6.8k 11 United Kingdom
27 Nov 2012 12:40PM
Does the lens still focus on AF? If it does, that suggests there are no critical contacts broken.
Has the broken focus ring revealed any gaps in the body ot was it only a skin over the main part of the body?


How old is the lens? I ask because beyond the warranty you also have customer rights relating to general build quality. The warranty is there to cover components such as eletronic bits and pieces but build quality is different though a bit more 'touchy feely' in its definition. There are different factors coming into this such as price, brand reputation and age of the item. As an example, you would not expect the focussing ring on an L lens to fall off after 2 years because you pay for the quality but for a cheap-an-cheerful third party lens (not that Tamron is 'cheap and cheerful') this may not be a surprise.

So it may be worth contacting Tamron and seeing what they say.
joora 1 2
27 Nov 2012 4:12PM
The autofocus works fine, seems that only the plastic mask (plastic focusing ring) detached from the metal barrel of the lens. When I position the ring in it's normal position, I can even do manual focus. But when I pull the ring towards the front element it comes off easily. I can see the glue residue on the metal part where the ring is normally positioned.

When I pull the ring all the way up, I can see the inner zooming mechanism exposed, but I don't think it is in any way connected with the plastic ring.

I think it can be glued back without any significant problems, I only need some recommendations on which type of glue to use (the barrel is metal, the ring is plastic, and I think that it would be a good thing that it has high viscosity to avoid any further damage).

The lens is fairly new, but it was bought through ebay (bulk packaging) since it was significantly cheaper than the retail have them in my country. the obvious downside is that I didn't get any warranty with my purchase.
mikehit e2
5 6.8k 11 United Kingdom
27 Nov 2012 4:39PM
I suspect that if you use superglue the fumes risk affectin the plastic coating on any wires inside the body (that is only a guess). Maybe Araldite?
Paul Morgan e2
13 15.7k 6 England
27 Nov 2012 5:27PM
I wouldn`t use super glue or Araldite.

Araldite will be a little thick.

Super glue, to runny and can leave horrible looking drying marks, it could even react with the plastic.

Get a tube of the general type stuff, most will be good enough.
Jestertheclown 6 6.4k 241 England
27 Nov 2012 9:37PM
Evo-stik or Bostik contact adhesive should do the trick. It can be mucky stuff but if you apply it very sparingly, it's easy enough to use.
I wouldn't bother with the wait-ten-minutes-until it's tacky though. Just apply as little as possible and put it together. It will go off just fine.
joora 1 2
1 Dec 2012 5:07PM
Thanks for all the tips. I'll see which of the mentioned glues are available where I live.

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