Fluorescent light interference? Help!

davek

davek

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david
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Probably about to make a fool of myself.

Playing with my new D7000 tonight at work. At shutter speeds of 1/100 and below everything is fine. Above 1/100 I am getting what looks like white balance shifts and exposure shifts on my images. These look like a broad horizontal yellow filter has been placed over the the top half, the bottom half or all of the image depending. The room has fluorescent lighting predominantly. Going outside the effect disappears and everything looks absolutely normal. I have tried various WB settings to no avail. I am using Program and Shutter Priority and full metered exposure.

I have taken loads of photos in this building previously without noticing this effect.

Any ideas?
Thanks!
 
HI fluorescent light is not a conctent light souce. It is made of rapid pulses. May be at 1/100 and over this pulsing is cousing the effect. Only a sujestion as I have never used above 1/60 under fluorescent
 
this is normal behaviour.

i took some photographs at a birthday party my daughter went to last year that was lit by ancient fluorescent tubes and my photographs had this really weird cast that you describe. I spend ages trying to fix it, but in the end i took the wimps way out and processed them mono - as Melvyn says it's because the light from the tube pluses with the 50hz mains current, at slower than 1/100 your camera can't see it.
 
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Yep, it's all completely normal.
It's due to the cycling of the lights.
Do a google search of "light cycling" or something similar and that should turn something up
 
Try to use a lower shutter speed and/or bracket and this will usually solve the problem.
 
First time I came across this I thought the previous owner of my camera had set the bracketing to wb, it was only when I took a wide angle shot of the arena that I realised there were three different types of lights, all cycling at different frequencies....
 
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