More exactly : I recently got this old 50mm f1.4 that I like very much, but the rubber grip used to focus got unglued. Before I glue it back with fast glue, any caveats, things I should definitely not do or use, or specific kinds of glue to use absolutely ?
Also, when a lens has dust inside, how expensive is it to have it cleaned / how difficult to do it yourself ?
Thanks in advance

Also, when a lens has dust inside, how expensive is it to have it cleaned / how difficult to do it yourself ?
Thanks in advance
