I have had the same exact problem with my nikon d7000, i have bought it 2 weeks ago and was filming outside then walked inside and all of the sudden there were 3 yellow bars across the screen. when i shot photos they went away but when i filmed in video mode they came back, and stayed there. i shut the camera off and let it sit and they eventually went away but this problem scares me.
D700 issue/malfunction: yellowish bar in photos(77 posts) (20 voices)
as stated earlier it is the lights. freaked me out too until i knew what it was.
the frequencies are typically 50hz or 60hz. For 50 hz you need to shoot 1/100 or faster. The is so that you can catch the light from the dimmest point to the brightest point in a cycle. 1/50 or faster would capture a whole cycle and therefore be best.
with 60hz it is 1/125 or faster for the same reasons.
look up the frequency in your area. japan has mixtures of both for different areas.
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