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New Contributor
Posts: 2
Registered: ‎02-12-2020

Auto-focus problem

my Canon 70-200mm F2.8 USM lens and the lens wont auto focus. It focus for the first shot and then struggles to focus ...

When I hold the shoot button half way, the lens is just focusing back and forth, and not finding anything to focus on.

Manual focus works perfectly tho, I bought it used online and i barely used it
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VIP
Posts: 12,252
Registered: ‎12-07-2012

Re: Auto-focus problem

Could be too close or too dark or it's broken.  Could be several things but you need to be more clear about how you used it and on what camera. What conditions? As much info as you can give.

EOS 1DX and 1D Mk IV and several lenses!
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Honored Contributor
Posts: 5,292
Registered: ‎06-25-2014

Re: Auto-focus problem


@ebiggs1 wrote:

Could be too close or too dark or it's broken.  Could be several things but you need to be more clear about how you used it and on what camera. What conditions? As much info as you can give.


And if you have a Canon flash unit, make sure that "AF Assist Beam" is turned on.

Bob
Philadelphia, Pennsylvania USA
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VIP
Posts: 9,201
Registered: ‎08-13-2015

Re: Auto-focus problem


@tsingi wrote:
my Canon 70-200mm F2.8 USM lens and the lens wont auto focus. It focus for the first shot and then struggles to focus ...

When I hold the shoot button half way, the lens is just focusing back and forth, and not finding anything to focus on.

Manual focus works perfectly tho, I bought it used online and i barely used it

If the lens cannot focus outdoors on a sunny day on something 20 feet away, then the lens is likely faulty.

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"Doctor told me to get out and walk, so I bought a Canon."
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New Contributor
Posts: 2
Registered: ‎02-12-2020

Re: Auto-focus problem

The lens was shooting perfect during events, and even close-up shoots but now it doesn’t get a focus
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VIP
Posts: 9,201
Registered: ‎08-13-2015

Re: Auto-focus problem

It needs service.
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"Doctor told me to get out and walk, so I bought a Canon."
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