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www.urbanfox.tvZEBRAS
The ZEBRA switch is in the panel protected by the LCD screen.
1. ZEBRA OFF – no zebra stripes
2. ZEBRA 70% - zebra stripes appear on any part of the picture that is about 70% bright.
3. ZEBRA 100% - zebra stripes appear on any part of the picture that is 100% bright or above.
Zebra stripes are a device that puts diagonal lines into highlights in the viewfinder (not on to the tape! Just in the viewfinder). They act as an indication of exposure levels and so can be used as an aid to getting the exposure right.
Think of the 100% zebra level as an audio meter it tells you when things are too loud (in this case, too bright). When you record sound too loud, it distorts and becomes unusable. Well in video terms if large parts of your picture are 100% bright and above the detail in those areas will becomes crushed (and so lost ).
The 70% zebra is probably more important, because it help you get faces correctly exposed. White Caucasian faces - when correctly exposed are between 60-70% bright. So if a face has a little bit of 70% zebra on it then it will be about right. There will always be a few hot spots such as noses, foreheads and the shiny bald head - it's the reason we use makeup in TV to reduce the hot spots.
Remember a good way to check exposure is to ask the camera. Zoom in to the face - go to auto iris and let the camera decide the face's exposure - go back to manual iris - and zoom out to frame your shot.
There really is no real guideline as to how much Zebra you'll see in the picture. It entirely depends upon what you are shooting and how much there is of it in the frame. Eg a correctly exposed shot of the sky could have 70% zebras all over it - but little or no 100% zebras
PLEASE NOTE -
1. Working in the manual exposure mode you would be well advised to use the zebra stripes.
2. Professionals tend to set their Zebras to between 90-95%. Because 70% is thought to be too low and 100% to high.
3. Zebras only appear in the viewfinder and LCD screen - not on the output. Think about it - when did you last see zebra stripes on the telly (except on wildlife programmes!).