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| p.1 #8 · Canon 300mm f2.8 non IS auto-focus motor needed |
Ed Sawyer wrote:
It's probably not the actual USM rings themselves but something related to them, e.g. the driver circuits and assembly. These used the L1 (77mm) USM, which was also shared with the 85/1.2, 50 1.0, 200/1.8, et al. So, there would possibly be some spares to be had from cannibalizing something like that, though that's not a cheap option either. I'd 2nd the recommendation of sending it to Midstate and have them check it out. Maybe something can be done. Hopefully so! It's too good of a lens to just toss.
The problem is the failure may be a common part among all the lenses making it even more difficult or impossible to fix. I recently sent one of these older tele's in to Midstate and Mark gave two possible causes (USM Motor or DC/DC converter) but could not make the repair.