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|| SportsShooter.com: Member Message Board
My lens has gone schizoid
Phil Hawkins, Photographer
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Fresno | ca | usa | Posted: 12:02 PM on 04.15.09 |
->> My Canon 70-200 2.8 IS on a 1D MKII yesterday was searching wildly for a focus. It was weird; the AF was searching in very short in-and-out motions, rhythmically... very quick and short movements looking for a focus. Subject matter provided plenty of contrast for a lock. Turn the camera off for several minutes and it works fine for a while, then starts it's weird AF thing again. Before I send it off to Canon, is there a quick fix anyone knows of I can try? I've done everything I can think of, and nothing would correct it.
Conditions were very windy, lots of dust in the air... I tried cleaning both ends of the lens and nothing changed. I just thought maybe someone has had this happen and knows a solution short of sending it off. |
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Dave Prelosky, Photographer
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Lower Burrell | Pa | US | Posted: 12:27 PM on 04.15.09 |
->> Phil,
Try setting the camera on bulb and have a look at the AF sensor window in the mirror box. If there's dust over the sensor, the system will have a tough time finding the contrast necessary to determine focus. Hope it's that simple... |
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Phil Hawkins, Photographer
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Fresno | ca | usa | Posted: 1:31 PM on 04.15.09 |
| ->> Thanks... will do. |
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