I just got a OM-1 F-Zuiko 200mm f5 (not f4!) lens (serial number 120xxx) with a known fungus condition. The infection did not look too bad and the price was right.
I have been able to remove the rear two lens elements (behind the diaphragm) and the front element, but I am having trouble getting out the next two lens groups, the doublet and the plano-concave lens in front of the diaphragm. From the exploded parts diagram that is online it looks like the only thing holding the lens group in is a retaining ring which is about 1cm wide. It looks like the ring might have some thread lock applied, so I have been soaking it in acetone, without success so far (half a day).
Does anyone have any experience with this lens and any suggestions as to how to proceed?
I have been able to remove the rear two lens elements (behind the diaphragm) and the front element, but I am having trouble getting out the next two lens groups, the doublet and the plano-concave lens in front of the diaphragm. From the exploded parts diagram that is online it looks like the only thing holding the lens group in is a retaining ring which is about 1cm wide. It looks like the ring might have some thread lock applied, so I have been soaking it in acetone, without success so far (half a day).
Does anyone have any experience with this lens and any suggestions as to how to proceed?