Canon EOS 1D Software Instruction Manual page 177

Settings on the [IPTC-2] tab sheet
You can enter up to 10 characters.
Select [Highest Priority (=1)], [Normal (=5)], or
[Low Priority (=8)] from the list box.
You can enter up to 256 characters.
You can enter up to 8 characters.
You can enter up to 11 characters.
Settings on the [IPTC-3] tab sheet
You can enter up to 3 characters.
You can enter up to 32 characters.
You can enter up to 32 characters.
You can enter up to 256 characters.
You can enter up to 32 characters.
Setting the IPTC Information
You can enter up to 32 characters.
You can enter up to 32 characters.
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