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07-03-2013, 07:40 AM   #1
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Strange AWB Thingy.

Last night, I was shooting Table Tennis and had the K-5 in AWB. While shooting multiple frames on high, I noticed that the WB would change from warm to cool and back again. Any thoughts?

07-03-2013, 07:45 AM   #2
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QuoteOriginally posted by tabl10s Quote
Last night, I was shooting Table Tennis and had the K-5 in AWB. While shooting multiple frames on high, I noticed that the WB would change from warm to cool and back again. Any thoughts?
I noticed that it happens to my k-5 as well when I am shooting in the same high-continuous mode. It does not happen all the time though... would be nice if someone can find out the possible reason for it.
07-03-2013, 07:55 AM   #3
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Is there fluorescent lighting? Or some other flickering light source?
07-03-2013, 08:03 AM - 1 Like   #4
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I'd guess fluorescent overheads. They produce a banding effect that can play all sorts of games with what the camera produces.

07-03-2013, 08:54 AM   #5
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Yeah, at the wrong shutter speed you end up capturing incomplete cycles of the electrical current under fluorescent lighting. The best way to avoid it is to set your shutter speed either at the frequency of the local current, or a multiple thereof. I normally use 1/60th as that will capture two full cycles. Unfortunately when shooting fast action like table tennis, that may produce some undesirable blur.

If you were shooting under incandescent light, then I just chalk it up to AWB begin a flawed notion all together. Why keep guessing at something that isn't changing from shot to shot?
07-03-2013, 09:44 AM   #6
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I set WB manually for the next burst and the same thing happened. There are two other gyms that I shoot in and this has never happened.

Last edited by tabl10s; 07-03-2013 at 11:21 AM.
07-03-2013, 09:59 AM   #7
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There is also a setting in the custom menu called WB adjustment range, or something to that effect. Basically it allows the camera to tweak the WB even when you specify it. Needles to say that was one of the first "features" I disabled on my camera.

However what you are describing still sounds like the effect of florescent light cycles. I've even seen individual frames where part of the frame is amber, and part of the frame is green. It really depends on the shutter speed.
07-03-2013, 11:20 AM   #8
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QuoteOriginally posted by JinDesu Quote
Is there fluorescent lighting? Or some other flickering light source?
All fluorescent and I'm standing in one spot.

07-03-2013, 11:26 AM   #9
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Should I go faster on the shutter speed our slower? How would I know the frequency of the lights?
07-03-2013, 11:30 AM   #10
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Depends on your location. US is 60hz (1/60s). EU is 50hz (1/50).


Effect of fluorescent light with video. You don't see the AWB changing, but i think with still images shot at high speed, it can be affected.
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