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Archive 2012 · Need Help with Nikon D3 Focusing Issue
  
 
ultravista
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p.1 #1 · Need Help with Nikon D3 Focusing Issue


I have had my Nikon D3 for several years now and primarily shoot MMA and boxing. My primary lens is the 24-70mm f/2.8. The typical setup is manual, 640 to 800ths of a second @ f/2.8, ISO 1000 to 2000.

For live fights, I go for center-mass of the fighter to make most of the target.

Recently, Iíve been having a lot of problems with capturing images of fighters (while fighting) in focus. The usual problem is focus elsewhere behind or next to the fighter instead of the fighter themselves. Iíve run though the different focus options such as dynamic area 9/21/51 AF points and AF point selection of 11 and 51. The body is setup for AF-ON on the AF-ON button as well as the shutter. I also mix between dynamic and single AF and spot, matrix, and center-weighted metering. I have also tried focus tracking lock from off through 5 (longest).

This does not appear to be a back focus issue as the lens lines-up with testing on well-lit subjects.

The body has been reset to factory defaults several times; the issue persists.

Despite numerous combinations, I seem to catch focus on the fighters surroundings instead of the fighter. When on the fighter however, the image is tack-sharp.

I am looking for advice on what may be the issue. At this point, it could either be me or the camera settings. It seems like the camera will focus where it thinks it should focus vs. where I am telling it to.

Any help?



Nov 23, 2012 at 06:05 PM
Kry27
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p.1 #2 · Need Help with Nikon D3 Focusing Issue


Have you cleaned the af sensors?


Nov 23, 2012 at 07:00 PM
ultravista
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p.1 #3 · Need Help with Nikon D3 Focusing Issue


How do you clean an AF sensor?


Nov 23, 2012 at 07:05 PM
 

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trenchmonkey
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p.1 #4 · Need Help with Nikon D3 Focusing Issue


you've had the D3 for several years There are slits just under the sensor/filter...
take your rocket blower and make a few passes. This was SOP on the D3/D700/D300(s)
when quirky AF reared it's ugly head. Haven't seen it myself in ~4 yrs since I started reg.
preventative maint. on a battery change. Takes maybe 10 seconds, now I don't miss.



Nov 23, 2012 at 08:26 PM
NathanHamler
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p.1 #5 · Need Help with Nikon D3 Focusing Issue


basically you have to go mirror up to be able to see them.....so either lock the mirror up for cleaning, or switch to mirror up, but that's kinda risky, in case you accidently hit the shutter release a 2nd time, and the shutter cycles.....


Nov 24, 2012 at 01:41 AM
ultravista
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p.1 #6 · Need Help with Nikon D3 Focusing Issue


I visibly inspected the AF slits, there appears to be no obstruction. Nonetheless, I blew them out with a blower.

What would cause quirky AF if there's dust on the sensors?



Nov 24, 2012 at 05:40 PM





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