Question about Canon EF 50mm f/1.8 II Lens

3 Answers

Dropped the lens, nothing broke but focus ring came undone

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

Posted by Cristina... on

  • grahammccaul Aug 31, 2008

    I have exactly the same problem with the focus at infinity (at the extreme where the focus barrel is shortest) the whole front section of the lens comes away to reveal the auto focus motor etc. I do not think that spot glue or sellotape will work - it appears that there should be a catch of some sort that has been broken - lens works fine as long as it does not need to be focused at infinity. Any ideas?

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3 Answers

Purushotham Racharla

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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

  • Purushotham Racharla
    Purushotham Racharla Jan 20, 2012

    Please make sure that ring is in correct position by doing a trial assembly of internals before gluing. If you glued it in the wrong position u can never push the focusing ring in

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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

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This will need technical service eventually. Try temporary solution with Sellotape or similar

Posted on May 07, 2007

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Hi,

This error indicate that focusing ring got stuck or jammed due sand, dust or may be due to external shock caused by dropping the device.
  • Try compressed air. With a fine tip blow off gun around lens barrel. It should remove all dust and sand. Turn the camera on this will solve the problem.
  • You can gently bump the camera to try to free the focusing ring.
  • You can try to turn camera ON at the table (facing it to the ceiling), don't put camera down face to the floor when opening.

If motor is running but lens won't retract sometimes lens would slip off with the gear or break off a tooth in the gear when it gets dropped. Try to gently move the lens barrel around with the finger and see if it is moving, but if tooth or gear is broken lens will move once or twice then it will stuck again.

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This error indicate that focusing ring got stuck or jammed due sand, dust, may be due to external shock caused by dropping the device.
  • You can gently bump the camera to try to free the focusing ring.
  • You can try to turn camera ON at the table (facing it to the ceiling), don't put camera down face to the floor when opening.
If motor is running but lens won't retract sometimes lens would slip off with the gear or break off a tooth in the gear when it gets dropped. Try to gently move the lens barrel around with the finger and see if it is moving, but if tooth or gear is broken lens will move onces or twice then it will stuck again.

Else your camera need to be disassembled to get at the focusing ring at Service Center.

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This camera has TTl auto focus so it can't be switched to manual so that idea is quickly stomped on. A silly question, are you half pushing the shoot button down first to activate the auto focus. If you don't and just hit the shoot button you'll definitely get out of focus shots. Have you sat down and read the manual on how to correctly focus. A number of things can crop up which can fool the autofocus into a wrong setting. Have you dropped the camera or has someone else done so? The lens assembly could be damaged. Try pointing the camera at something about three feet away whilst half pushing the shoot button then still holding the button half way point the camera at something a long way off. Can you hear the mechanism trying to focus and does the picture in the LCD change. If it's all quiet and the picture doesn't change then it could be a damaged focus motor or a connection to it is broken. Are you sure the camera isn't switched to Macro. A lot of people get caught with that one. You'll never shoot a focussed picture in macro unless it's less than a foot or so away. BMW
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