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Old Wednesday 10th January 2018, 00:29   #27
henry link
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Join Date: Feb 2004
Location: north carolina
Posts: 4,281
Looks like Canon's AFOV spec is a calculation using the ISO method. Neither that method nor the 65 simple calculation takes distortion into account. Swaovski's spec appears to be an actual measurement of the "true" AFOV including distortion.

Without measuring it we can't know the "true" AFOV of the Canon, but since we know it has some pincushion distortion, it's reasonable to to assume a value somewhere close to the midpoint between 59.2 and 65.
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