canon 50mm 1.8 fd fix

eclipsechaser · Joined: 19 Mar 2015 Posts: 4 Location: london

Hi guys. Been getting into tinkering with camera equipment and recently found the above lens. I have found plenty of advice on the net about fixing the lens apart from how to get into the bit that holds the 2 rotating front lens elements together. I was wondering if anyone knows how to open it without breaking it.

mo · Expire: 2016-07-30

eclipsechaser · Joined: 19 Mar 2015 Posts: 4 Location: london

Thanks for the help

cooltouch · Joined: 15 Jan 2009 Posts: 9109 Location: Houston, Texas

Have you tried peeling back the rubber ring on the focusing collar? This is usually where the screws are located that secure the focusing helicals to the lens body. When you separate them, it's a good idea to mark in a nondescrpt area the point it which they disengage. It helps preserve infinity focus when reassembling them.

I've found that sometimes I haven't marked the pieces correctly, and when that happens, it's a matter of trial and error getting the helicals back where they should be -- so infinity lines up with the index mark. But this isnt that big of a deal, in case you miss. It just means you get to take a few tries at it before you hit on the right heical combination.

eclipsechaser · Joined: 19 Mar 2015 Posts: 4 Location: london

sorry for the delay in getting back. There is no small rubber ring on the small piece I took out of the lens casing as shown in the pics above.

eclipsechaser · Joined: 19 Mar 2015 Posts: 4 Location: london

Gardener · Joined: 22 Sep 2013 Posts: 950 Location: USA

You just carefully slip some tool under the retaining collar and pop it off. Small flat head screwdriver, plastic fork, toothpick - all will work.