I have a C3 with a telephoto lens that I use now and then. Once the cap and gear are removed, the lens is turned Counter-clockwise to remove it. It may be cross threaded or glued in. If that is the case, it will be difficult to remove without doing damage. Sometimes just hot water will loosen glue.Originally Posted by lambertsz
A spray of WD-40 penetrating oil on a Q-tip, then wiped along the base of the lens may help loosen it.
I hope this helps.