Due to limitations in the Canon and Nikon Software Developer Kits, a computer is required to act as a bridge between your iPad and your DSLR--OnOne offers free server software for Mac OS X and Windows that facilitates the connection between the iPad and DSLR. Once you've established the connection, you'll be able to use the iPad's spacious display to view your camera's viewfinder in real time, snap photos, review your images, and adjust camera settings like white balance, shutter speed, aperture, and exposure compensation.

The app also features an Auto Bracketing mode for expanded exposure brackets, a Burst mode for continuous shooting, and the ability to save low-res versions of images to the iPad for emailing and sharing. The app supports a wide range of Canon EOS cameras and Nikon D series cameras, though feature availability varies from camera to camera. You can check the for details on your specific camera model, which would be well advised since, at $50, DSLR Camera Remote HD is one of the pricier apps available for the iPad.

DSLR Camera Remote HD runs on iOS 3.2 or later.