04-23-2016 12:09 PM
Does anybody know how to fix this problem, or even know if it's a sensor or lens problem? I was shooting a show last night and noticed these stripes about halfway through. I was shooting at 4000 ISO, 1/1600 and the stripes were extremely prominent, so I thought it was the shutter speed. I slowed down to 1/640 and got the same result. I was also using a 70-200L IS II USM. The first image was at 1/1600.. The second image was at 1/1000, and the third image was at 1/640. Any help is greatly appreciated.
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04-23-2016 12:31 PM - edited 04-23-2016 12:32 PM
I believe the shutter on a 5D3 moves vertically, and at those speeds it moves as a slit, with the closing curtain trailing the opening curtain by less than the height of the frame. If the concert was using high-speed strobe lights of different colors, you'd see a band of whatever color light fired when the slit was in position to record it.
04-23-2016 12:40 PM
Lower the shutter speed to the maximum flash sync speed which is basically the same problem.
My T6S has flicker prevention, if your camera has it, you might try that, too. Though it is geared for 50/60 Hz flicker.
04-23-2016 12:43 PM
04-23-2016 12:43 PM
Thanks, any tips to avoid this? And it's not a camera problem?
Well, it's a camera problem in that it's a consequence of the way a focal plane shutter works. You can minimize the effect by using a slower shutter speed; but if the color of the ambient light is changing rapidly relative to the speed that the shutter curtains travel, there can still be a difference in color between the top and bottom of the frame.
04-23-2016 12:46 PM
04-23-2016 12:58 PM
That makes sense if it's just a gradient color difference from top to bottom, but the fact that there's bands in between, makes me think something different. Color, black, color black. I don't think the strobes were changing that rapidly.
It's not just the rapidity of change; it's also the duration of the flash, which can easily be 1/1000 second or less. You may not notice how fast it is, because of the relatively slow recycle time of the human eye, but the camera notices. If the shutter slit reaches a given position and no light fires while it's there, you'll see a black bar.
04-23-2016 05:40 PM
I'm more convinced that these are good old fashioned JPG artifacts. Stick with as little compression as possible. Shoot in RAW don't use jpg and definitely not in anything less than a large jpg. Also stick with sRGB color space.
I really doubt it is your choice of SS causing it.