The 1.3x crop factor of the APS-H sensor in the 1D Mk III turns my EF 70-200mm f/4L IS lens into an effective 91-260mm telephoto zoom. It's not super-long, but it's reasonably effective for urban wildlife.
If the weather were only slightly more clement, I'd have put it on the 7D for an even bigger focal length bump. It was quite frigid out, though, despite the unusually sunny winter skies.
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