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Implementation notes by Jan Brittenson (bson@rockgarden.net)
This is notes on the implementation and against
http://www.burren.cx/david/canon.html.
The Canon makenote implementation has been tested against S100 and G1.
The S100 doesn't output focal length information; it leaves the fields
zero.
Tag 0x8 (Image Number): the value 1000 should be 10000.
Tag 0x4 AF point isn't implemented since it's not really understood.
I'll take a stab at it.
Both the S100 and G1 output tags:
TAG 0x2-3:2,672,285,214,
TAG 0x10-4:67371008,
The latter appears to be a long broken into two shorts. The high-end
short is a large number, the low-end short a small number or zero.
Tag 0xc (Camera Serial Number) has been implemented but is untested
since neither my S100 or G1 creates this.
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