50mm 1.0 Dies

pulsar123 wrote in post #12768009
My understanding is that "focusing by wire" is done for those lenses, where for internal focusing to work well you have to move many groups of lenses around, with different pace, which make mechanical focusing impossible (or too complicated).

Nope, There is no many groups, just single one.
EF 300 2.8L USM is focus-by-wire, while IS version is not.

Making USM to manual focusable, all it needs is a clutch between USM ring and manual focusing ring.

Why don't you send it to Jamesburg or any of the other Canon service centers?

tunin wrote in post #12772479
Why don't you send it to Jamesburg or any of the other Canon service centers?

I have contacted Canon about a possible fix but am still awaiting a response. Hopefully (fingers crossed) they can get it done for me. If not I'm gonna track down a few of the other places mentioned by the helpful folk in this thread to see if someone can get this beast up and running again.

stay tuned

Call the folks at jamesburg, they were very helpful each time I called, this is the number I usually dial: 7325217007, 7325217000

Wonder if they will service it in Japan yet?

Fricks wrote in post #12767839
you could also use it for a toilet

That would give a new meaning to "red ring."

Probably you should contact Rainer Hönle in Germany. He is a very knowledgable Canon technican for AF lenses and DSLR cameras.

I think I only buy Zeiss from now on...