Easy question: which glue for rubber focus ring?

enzodm · Joined: 11 Sep 2010 Posts: 350 Location: Italy

I just received a Porst 50/1.7, seems not bad (and small). However, rubber ring is unglued from the body. By pressing I'm able to focus, however I would prefer to stop its movement. Any glue suggestion, considering the elasticity of rubber? Thanks.

peterqd · Expire: 2014-01-04

The trouble with trying to answer questions like this is that the same product can have different brand names in different countries, and very often products from USA or other places can't be sold legally in EU for "health and safety" reasons. Rolling Eyes

What you need is a solvent-based contact adhesive, the kind that kids like sniffing Smile

If you can get hold of some, spread a thin coating on both surfaces, rubber and metal, and allow it to become quite dry. When you fit the rubber back on, the glue will bond immediately, usually with no chance of adjusting it. However, there is a version of this adhesive which does allow adjustment if you can find it. Don't coat the whole surface, just two small spots 180� from each other should be fine if the rubber isn't too loose.

Another option, if it will work for you, is double-sided self adhesive tape. You might need to cut a small piece out of the rubber if it's very loose.

Rolf · Expire: 2015-12-26

Have done this yesterday with a lens - used "UHU Easy" (in Germany).

You have 15 sec. for adjusting, odor-free, for rubber and metal, solvent-free.

Wink

Scheimpflug · Expire: 2011-11-18

Lloydy · Expire: 2022-01-01

Another option that will allow the rubber ring to be removed later is to use silicone sealer, the stuff you put around a shower base to seal it.
It comes in black as well.

I use it to stick all kinds of stuff that I might want to get apart later.

enzodm · Joined: 11 Sep 2010 Posts: 350 Location: Italy

Thank you all. I have UHU at home, so I could try, but the silicone road could be good also because, by having some thickness, may effectively stop movement.