The SB-600 and D40 are both made by Nikon. The SB-600 is a camera flash, while the D40 is a digital camera. The D40 is Nikon's smallest SLR -- short for single-lens reflex -- camera at just over a pound. It is compatible with half a dozen Nikon lenses, including the SB-600.
SB-600
The SB-600 is a high-speed flash designed to work with Nikon's Creative Lighting System, called CLS for short. The SB-600's design allows it to fully illuminate even the most difficult picture-taking environment, for optimal picture quality. This flash can rotate up to 270 degrees from side to side, and up to 90 degrees up and down. You can use the SB-600 either by remote as a stand-alone flash, or mount it on a compatible camera.
D40
The D40 is one of Nikon's highest performing cameras, and at just over 16 ounces, it is also the camera maker's smallest SLR model. The camera's 6.1 megapixels guarantees clear, crisp images in portrait sizes up to 16 by 20 inches, while the D40's ability to shoot up to 2.5 frames per second gives users the ability to capture action shots. The D40 comes with its own built-in speedlight flash, although it is compatible with several other flashes from Nikon.
SB-600: Compatible Cameras
The SB-600 speedlight is compatible with 17 cameras made by Nikon. Among these is the D40, although the SB-600 works with several other models in Nikon's D-line, including the D3X, D3S and D7000. Both the SB-600 and D40 are equipped with Nikon's i-TTL -- or intelligent through-the-lens -- technology, which automatically adjusts the strength of the SB-600's flash output with the ambient light available in the shooting environment. The SB-600 and D40 also have red-eye reduction, automatic focus and zoom capabilities.
D40: Compatible Lenses
Nikon's D40 is compatible with half a dozen Nikon lenses, including the SB-600. All six of these lenses are "speedlights" by Nikon. These speedlights work to enhance the lighting ability of the built-in flash included with the D40. In addition to the SB-600, the SB-400 and SB-700 are also compatible with the D40.
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