Chapter Five: Capturing Light—The Exposure Parameters

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ISO

With aperture controlled by your choice of lens and shutter speeds limited by the laws of physics and principles of engineering, the EOS 5D Mk III has pushed the remaining variable to yet another degree of sensitivity. Whereas the EOS 5D Mk II offered an ISO speed range up to 25,600, the Mark III extends its speed range to 102,400. While you will seldom need such a high ISO, in implementing that range, Canon also extended the range of low-noise ISOs. As a general rule, whatever ISO you chose on the Mark II, you can multiply that value by four and expect approximately the same amount of ...

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