UPDATE: FD 100-300 aperture issue/repair

Just to update all of you on this lens. I took it to our locally authorized

Canon repair center. They wanted 100 bucks to fix the apeture. So I fixed it

myself. The diaphragm assembly was wet with oil as was the inner barrel. I

just took my time, and was able to remove the assembly.

 

Actually I disassembled to much of the lens, but I had nothing to lose really,

and everything to learn.

 

What I did notice was Canon has the assembly holes in certain areas, where

things just fit one way only.

 

So, if you are wondering, it can be done, just take your time.

Joe, could you provide us with instructions on how you did this. I have a 50/1.8 lens that's cloudy internally and I'd love to get inside the lens and see if I can clean it. The lens was a freeby so nothing to lose. I don't where to start regarding disassembly.

Can you tell which internal lens it is? I can tell you from past experience, pulling apart a 50mm f/1.8 is easy, getting it back together it ain't. it is just the front lens, no problem.

 

What type of 50mm do you have, the new one or old one?

Here is a website that shows a step by step take down. But it is in Japanese. But has good enough pics.

http://translate.google.com/translate?hl=en&sl=ja&u=http://dongamera.hp.infoseek.co.jp/page029.html&sa=X&oi=translate&resnum=10&ct=result&prev=/search%3Fq%3Dcanon%2Bfd%2Blens%2Bdisassembly%26start%3D30%26hl%3Den%26rlz%3D1T4GGIH_enUS265US266%26sa%3DN

 

Joe

>I took it to our locally authorized Canon repair center. They wanted 100 bucks to fix the apeture.

 

They still service FD lenses? Thats good.

Joe, it's a chrome ring 50/1.8 FD sc lens. I appreciate the link, I'm gonna see what I can do.

Mark

Mark,You probably already know about it but here is a link to a 50mm f1.4 breech ring teardown.

 

http://rick_oleson.tripod.com/index-161.html