Pentax DA 70mm Limited - Possible oily residue inside lens?

Started 3 months ago | Questions thread
jf_tea Senior Member • Posts: 1,457
have your tried lens cleaning fluid ?

If the oily residue is on the outside surface of the back element, have you tried cleaning it with lens cleaning fluid ?

It should work. If not on the first try, maybe after 2-3 times.

I've cleaned that surface of several lenses with good results and not much difficulty -- except the deeply recessed back element in the old S-M-C Takumar 135/3.5 -- but I succeeded, with the help of a coton swab

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