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Author Message   Turnergande Tinkerer Username: Turnergande Post Number: 18 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Saturday, June 30, 2007 - 01:51 pm:    I'm pretty sure the FL f1.2 is similar to the f1.4 & f1.8. Here's my disassembly notes for Canon 50mm f1.8 FL: Unscrew inner beauty ring using a pin spanner (or rubber friction tool) Lift off black aperture index ring Loosen 3 grub screws from chrome aperture ring and lift off Spin off lens outer lens cell using pin spanner and remove cell Front end of aperture blades & 2 inner lens surfaces are now exposed for cleaning if need be On the lens I worked on there was a small loose screw that was jamming the helicoids. Fortunately I was able to remove it. Upon reassembly the lens now appears to function normally. Upon reassembly make sure aperture index ring lines up with the lens barrel index mark Well made mostly metal construction, easy to work on. If anything here appears to be incorrect, please let us know. Gary Turner in Bozeman, Montana