melcat Offline Upload & Sell: Off
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Assuming you mean a Canon 5D Mk III - there is probably no reason to install the EOS utilities. Under 10.6 or later, the Mac OS X bundled Preview and (I think) iPhoto can read Canon raw files, and Image Capture can do some limited tethering. In any case most photographers at that level will be using specialist software like Lightroom, Photoshop, Capture One or Apple's own Aperture. That really leaves frills like wanting to change the Artist/Owner metadata.
"Reverting" 10.7 to a lower patch level is AFAIK not an option as 10.7 and later are maintained from the App Store and not the old Software Update. You don't get a disk any more. Recovery would download the latest patchlevel. He also should be at the last x in 10.7.x for the security patches.
If "the specs" refer to Canon's, I would say failure to support a 1 year old OS (Mountain Lion - and 10.9 is already in beta) is reason enough not to install their software on a production machine.
A lot of people dislike 10.7 and went straight from 10.6 to 10.8 if they upgraded at all, so I also don't think it's a good idea to strand your father on 10.7 just to run software of limited usefulness.
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