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Old Jan 12, 2008, 3:32 AM   #1
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Hi all, I have posted this elsewhere but have not received any help. I have a Canon EF 70-300mm f4-5.6 IS USM lens and I cannot get it to auto focus. I can hear it trying,but nothing happens.I have tried cleaning the contacts with a soft cloth, as the book suggests, but no luck. Is there anything else I can try,or should I send it in for repairs? Any help greatly appreciated.Thanks. John.




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Old Jan 12, 2008, 5:42 PM   #2
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If you can hear it trying, then it's probably not the contacts. Sounds like a stripped gear - the motor is turning but the lens is not. Have you tried moving the AF/M switch back and forth a couple of times to see if that makes a difference? Otherwise you will probably hae to have someone look at it.
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Old Jan 13, 2008, 1:37 AM   #3
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looks like the camera is in AI-Servo..Can u confirm if its not in AI_Servo.

If its a 40d its the AF-Drive button near the top LCD.

Clearly feels like AI-Servo(I am sure u can take pictures too...)
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Old Jan 13, 2008, 5:55 PM   #4
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Thanks Michi and nymphetamine, I have tried moving the AF/MF switch a number of times with no luck. The camera is a Canon 20D. It is on one shot,not A1 servo. John.


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Old Jan 14, 2008, 5:19 PM   #5
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Try some lens cleaning solution of the contacts but give some time for the solution to dry . Apart from that i cant see what else could be the problem.

i am sure there arent any limit switch on that lens. Try twisting the fine focus ring forward and backward.

If nothing works i am guessing tis time for canon visit
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Old Jan 16, 2008, 5:17 AM   #6
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I've tried all so now it looks like a trip to the doctor. Thanks for the help. John.
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