Question about Canon EF 50mm f/1.8 II Lens
Hi there, today during a fashion editorial shoot one of the models accidentally dropped my 50 mm 1.8 lens. Nothing broke, it actually still focuses *manually and automatically, but the front part (the focus ring) is loose... that is, if you tilt the lens forward, the insides will come off but not completely (it seems all the other parts are where they should be). This only happens when the focus ring is turned all the way left because the inner rim matches a dent in the body. I'm having a real hard time trying to describe the issue here. I would love to know if there is a way I can fix it myself. I'm in Venezuela and technical support here will take ages. I'm wondering if a bit of contact glue might keep the ring in place and hence supporting the rest of the elements inside the case. If contact glue is the solution, where should I put it? I'm afraid of sticking any moving parts. please help! Thank you! -Cris
Yes this a common problem in Canon 50 mm lens. This can be fixed permanently without modifications.
In a normal lens, the internals will never slide out while focusing on either end.
But if the metal locking ring gets dislodged from its position then the internals slide out in the infinity end.
The locking mechanism is such that rising rings have recesses and the focusing ring has raised portions matching them. With rings in place they never get aligned except when the focusing ring is moved beyond infinity, which is possible only during assembly when the lock is removed.
To solve this you will need to remove the internals from the outer barrel and fix the inner ring(thicker) in its lip in barrel while it is in fully rotated to clockwise position looking from front of lens.
There are instructions available about opening this lens and these very easy.
In the process of opening the lens You will remove the switch plate where auto/manual switch is located. Under this is a lock. When u remove this, the focusing ring can rotate a little beyond the infinity position, where the recess in locking in rings and raised portions on focusing ring match in a normal lens.
Remove the internals, lock the inner ring in position by a small drop of super glue on the rind before it is moved to its final position inside a lip.Note that , If u made a mistake u cannot loosen the ring again. I advise practice putting imagining your applying a drop and glueing it.
After you do this u can assemble the focusing ring . Turn it back a litle and then put the lock in place and your done.
Posted on Jan 19, 2012
I juts glued mine with Krazy Glue. I applied a bit of glue with a toothpick between the camera-side metal ring (inside the focusing ring) and the plastic lip of the lens body. I made sure to use a Q-Tip to wipe any excess off, and then what I did was put the lens on the camera and put it in AF, with the camera on I just kept focusing it at all different distances by half-depressing the shutter so that if any glue DID get between the metal rings then it wouldn't get stuck. It works great, though the metal rings can be seen now, No amount of pushing was getting those rings to disappear inside the body.
Posted on Jul 23, 2010
This will need technical service eventually. Try temporary solution with Sellotape or similar
Posted on May 07, 2007
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Posted on Jan 02, 2017
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