Question about Canon EF 70-200mm f/2.8L IS USM Autofocus Lens

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Canon 70-200mm f/2.8 IS lens not focusing

I have had this lens for about 1 1/2 yrs. I did buy it used. I shoot basketball and basesball games with it. No problems at all, until now. At basketball games about 1/4 of my pics are out of focus - either completely blurry or slightly blurry. The lens just doesn't seem to be focusing in all the time. I am not donig anything different at all and have checked all the settings numerous times. I shoot pics at all basketball games, so I've taken a lot of shots to compare. Any suggestions as to what it could be?

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  • cambera bug Jan 06, 2008

    The rear optic did have a large smudge mark on it. I cleaned it off and I'll have to wait until next game to check it out. Thanks and I sure hope that is all it was. Baseball season is coming up and I really do need that lense then.

  • Sconzmon Apr 10, 2008

    The lens had been working fine until all of a suden from one moment to the next it no longer focuses either in AF or MF. The problem was not my camera as other lenses worked fine. The same lens also did not work on another camera.

  • kameleondesi Apr 26, 2009

    I bought my lens in 2005 and has worked beautifully until now. My lens will focus sometimes. one shot will be in focus the next three out of focus, the next one in focus. I have cleaned it, checked the auto focus, all my settings, even changed the battery. I called a local photo equip. co. and they said my lens needed remapped. Does that sound about right? and For $250.

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I have had to replace the focusing servo motor is these before. The problem of seeking without locking in may mean the same for your lens. Do check for a dirty filter on the front and look to see if the rear optic is dirty or cloudy first. I'm assuming other lenses work fine on your camera.

Posted on Jan 05, 2008

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Posted on Jan 02, 2017

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1 Answer

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Test your camera's focusing ability with a book or magazine where you focus on just one specific line and see if it is truly in focus when you review the picture.

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Hi,
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1 Answer

Focusing Difficulties


1. Typical problem subjects for autofocus 1) Very low-contrast subjects 2) Overlapping nearby and distant objects 3) Very bright subjects in the center 4) Subjects moving very fast 5) Subjects through glass Focus on an object that is at the same distance as the desired subject, apply Focus Lock, and then recompose the picture. Or set the lens focus mode switch to (or), and focus manually. (Manual focus is only possible with cameras providing this feature.) 2. Attempting to take pictures out of the camera's shooting distance: When taking pictures out of the camera's shooting distance, the subject will be out of focus. The shooting distance differs from each camera model. Please check the specifications of your camera in the instruction manual to determine the shooting distance.

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