Sony XDCAM-EX3: ISO Rating(s)?

ISO is about sensitivity.  Useful to know when using a lightmeter – e.g. the iPhone’s “Light Meter” app, where if you enter ISO it tells you the required aperture f-stop.   For the EX3 the ISO depends on several factors, such as Gain, Gamma, Recording Mode (definition and interlaced/progressive).  But a reasonable rough conservative working figure is 400.  More specifically:

  • 400 for 1080p
  • 500 for 720p
  • 800 for 1080i
    • (some say this surprising result derives from the interlaced lines each being derived from the sum of a pair of neighbouring lines)


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