Originally Posted by
Sheldon N
I recently had this problem as well on the same lens. The rear group on this lens comes apart in two pieces - first the cell with the optics then a spacer, and the retaining ring is beneath both.
I could get the rear optics off, and the retaining ring loose, but the spacer remained firmly in place. I have never seen something this stuck before, took quite some doing to get it off.
I ultimately used a rubber jar opener (flat piece of tractioned rubber for getting open stuck jar lids) combined with a pair of wide mouth vise grips. I had to hold the shutter very carefully to not bend any of the levers, and also take great care to make sure that the rubber stayed between the vise grips and the rear spacer (don't squeeze too tight). Ultimately it wasn't brute force that got it off, but carefully working it loose.
Hope this helps!
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