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Associate applications with different digital cameras.
Apple's Image Capture application doesn't get much attention compared to iPhoto, but it's been revamped for Snow Leopard in several interesting ways. One of those is the capability to associate different cameras with applications. If you shoot with more than one digital camera (for example, if family members each have their own camera and you want to keep image libraries separate on one Mac), do the following:
Launch Image Capture (found in your Applications folder) and connect a digital camera or insert a memory card from one of the cameras. Select the camera under Devices in the sidebar and make sure the device info appears: click the button at the lower-left of the window.
From the "Connecting this camera opens:" pop-up menu, choose a photo application, such as iPhoto or Aperture (if you have it installed on your computer). Repeat the process for any other cameras or cards. The next time you connect one of the cameras, the specified application launches.