Quote Originally Posted by teraflame View Post
Mineral spirits got into the lens somehow and now my 85 1.4's focus ring feels very loose. Nothing else went wrong, aperture and image quality is still great. How or where can I fix it?
Send it to a competent technician. The grease (which was dissolved by the spirits) on the focussing helicoid needs to be replaced, and it will need a thorough cleaning of wherever else the mineral spirits contaminated.