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Canon Super Canomatic R 50mm f1.8
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PostPosted: Wed Jan 17, 2018 8:41 pm    Post subject: Canon Super Canomatic R 50mm f1.8 Reply with quote

Had this lens for a while, decided to try it out, but discovered the aperture blades are stuck in the fully closed position. Anyone got any experience taking one of these apart to repair it? Looks different in construction to the later FL.


PostPosted: Thu Jan 18, 2018 11:20 am    Post subject: Reply with quote

I assume you're familiar with Canon R lens operation?
http://forum.mflenses.com/anyone-has-any-info-on-super-canomatic-r-85mm-1-8-t72872.html


PostPosted: Thu Jan 18, 2018 9:05 pm    Post subject: Reply with quote

In the 85 mm R and S, all the F/1,8 are 5/4 and all the F/1,9 are 6/4.


PostPosted: Fri Jan 19, 2018 8:35 pm    Post subject: Reply with quote

I've fiddled with the levers, to see if it needed cocking like the FD lenses, but not been able to get the blades to budge at all.


PostPosted: Fri Jan 19, 2018 10:53 pm    Post subject: Reply with quote

Remove rear groups (or front, I don't know how these Canons like it)
and a squirt of naptha on the blades?


PostPosted: Fri Jan 19, 2018 11:04 pm    Post subject: Reply with quote

I don't think the blades are stuck, they look free of oil, I think it's the linkage, but I sense I'm going to have to take it apart to find out.

Spent all day taking an FD 100-300/5.6 apart to clean of fungus, only to find one of the innermost elements has been so badly etched it feels like it's corroded, rough, so a waste of time. Oh well.


PostPosted: Fri Jan 19, 2018 11:28 pm    Post subject: Reply with quote

luisalegria wrote:
Remove rear groups (or front, I don't know how these Canons like it)
and a squirt of naptha on the blades?


Use drop or 2 on q-tip/ear buds, no squirting!