Currently Being ModeratedOct 18, 2012 10:17 PM (in response to bbckr95)
The raw support for Aperture 3 - Rebel xsi is directly built into MacOS X Lion, see OS X Lion: Supported digital camera RAW formats
I suspect you need to install the raw support for that camera separately if you want to use it with Snow Leopard; check the available raw support upgrades on the Support page: It is part of
Currently Being ModeratedOct 19, 2012 12:30 AM (in response to bbckr95)
If all raw supports are installed, but Aperture does not recognize the camera, it may be necessary to register the raw support for your camera with the launch services database.
See this post by Alan Roseman: