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'Throbbing' focus problem


washington,dc, US
44 posts

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matteliot Registered since 16th Mar 2006
Tue 01-Aug-06 04:10 PM

I was out shooting airplanes landing yesterday and it was probably nearly 100F or so outside.

I was using my d2x and a new 70-200mm VR, mainly at the 200mm range.

The first bunch of shots gave me no trouble with focusing, then about 20 minutes later, it stopped focusing like normal- it would get the focus, then -very quickly- refocus and the plane would be blury, then get the focus again and then refocus blury, and continue 'throbbing' back and forth.

This happened several times a second.

The focus indicator in the body wasn't giving me the circle during this period, it would just flash left and right focus indicators in sequence several times a second.

I tried: taking off my polarizer (heliopan circular), putting on a UV, turning off the body, taking off the lens and putting it back on, waiting a few minutes with the body off, changing focusing modes, etc, and there wasn't any difference.

Whether I tried to get it to focus at 200mm on airplanes or at 70mm on the grass 4 feet from me, it would do the same thing.

I first thought it might be getting faked out by the heat waves, but don't see why it would do the same thing to grass just a few feet from me with no visible heat waves.

I didn't have a second lens with me at the time, sorry. Firmware is 1.0b (the latest).

Could it have gotten over-heated? Possible lens issue?

Resorted to shooting manual.