Canon RF 50/f1.2 disassembly thread?

[Meakin]

Ok - decided to go ahead and have a look at shimming my Canon 50/1.2 (focus issues)

I seem to remember a thread with "step by step" pictures of a canon lens diassembly here on RFF - but for the life of me, can't seem to find it anywhere now.

Does anybody happen to have it bookmarked ?

Thanks in advance.

Cheers,

Meakin

 

[sanmich]

I think the thread was on the 50mm 1.4 and it wasn't on RFF.
Basically all normal and wides canon lens I have opened are pertty easy to work on:
you need a spanner wrnech and screwdrivers.
close to the rear optics (careful here, it may be very close) you should see a slanted ring.
Open it with the wrench. the optical block should now separate from the helicoid mount.
usually, between both you will find the shim.
Good luck

 

[Meakin]

Thanks Michael,

Sounds easy enough (and if it isn't - I won't hold it against you!) 😉

Cheers,

Meakin

 

[sanmich]

Welcome...
well the disassembly is IMHO easy, accurately shimming the lens seems to me much more problematic...
if the shim is to be reduced, well, you just have to polish it a bit.
if you have to add hieight, what are you going to do?
Also, checking the focus itself seems a problem to me unless you have a DRF.
In any case, good luck...