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The CIE 1964 supplementary standard observer uses a field size of

  • A.one degree
  • B.ninety degrees
  • C.ten degrees
  • D.two degrees

Answer: C

Larger fields involve retinal regions with a different receptor mix. Industrial samples are usually viewed at a size closer to ten degrees than to two. Field size changes the retinal region involved. Ten degrees suits most industrial samples better.

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