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Many modern digital cameras support tethered shooting, a process where you connect—or tether—your digital camera to your computer and save images to the computer’s hard disk rather than to the camera’s memory card. With tethered shooting you can view a photo on your computer screen immediately after you shoot it—a vastly different experience from seeing it on your camera’s LCD screen.
To see a list of cameras for which integrated tethered shooting is currently supported, please refer to Lightroom Help.
For a range of DSLR cameras including many models from Canon and Nikon, you can capture photographs directly into Lightroom 4 without the need for any third-party software. If your camera allows tethered shooting, but is not on the list of models supported by Lightroom, you can still capture images into your Lightroom library using either the image capture software associated with the camera or any of a number of third-party software solutions.