Author Topic: Circle of Confusion for Canon EOS 7D  (Read 3996 times)

adah

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Circle of Confusion for Canon EOS 7D
« on: August 18, 2012, 05:46:35 AM »
exiftool reports 0.011mm, but some Web resources say 0.019mm. Which one is more correct? Any source for the value?

Phil Harvey

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Re: Circle of Confusion for Canon EOS 7D
« Reply #1 on: August 18, 2012, 07:15:35 AM »
ExifTool calculates this as D/1440, where D is the focal plane diagonal in mm.  The constant 1440 is somewhat subjective, and different sources use different values.  You can set this constant to whatever you want by overriding this tag in the config file.

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

adah

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Re: Circle of Confusion for Canon EOS 7D
« Reply #2 on: August 18, 2012, 07:24:54 AM »
I have just realized that it can change with the image size, so it is also calculated...