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What circle of confusion is used in the ExpoAperture Depth of Field Guide calculations?

April 26, 2017Circle confusion depth expoaperture field guide Used

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What circle of confusion is used in the ExpoAperture Depth of Field Guide calculations?

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The ExpoAperture Depth of Field Guide, when used with 35mm film, is based on a permissible circle of confusion of 35 microns. If you are using the Focal Length Conversion Table for 1.5 or 1.6 equivalent focal length cameras, the ExpoAperture Guide computes the depth of field using a circle of confusion of 22.5 microns. When using the guide in accordance with the Medium Format Film Instructions , the permissible circle of confusion is 70 microns.