Stephen Lewis , Dec 22, 2009; 04:13 p.m.
Do you have the proper tools to open it up and the technical skills to put it back together correctly when done, especially if something pops out of place while open? If not, then don't think of opening it up yourself. Would you set your own leg if you broke it? I've opened up lenses before, but not ones which had any value to me....some worked terrific after my "surgery", some just stayed the dogs they were when I got them. I wouldn't personally work on my FD lenses, but Kirons, some of the lenses for the Exaktas, mostly manual daiphragm lenses etc seem easy enough to do....again with proper tools, etc.