ISO is how sensitive the image sensor is to light. If i was filming out doors and my aperture was set at f/22, i would need to either slow down the frame rate or turn up the ISO. This is because the lens opening would be really small and wouldn't let in much light. If there was movement in my shot i would have to turn the ISO up because if the frame rate was slow the image would be blurred.
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This is an example of some footage we had problems with white balance on. as you can see the whole shot is effected by the grainy blue colour. We were filming on aperture f/22 but we had not adjusted the ISO or frame rate. this is what caused this grainy blue colour. once we had realised we increased the ISO.
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