DX
From Nikonians Wiki
DX is Nikon's term for an APS-C sized sensor in a digital camera, which is smaller by 1/3 than the traditional 35mm film, and thereby gives an apparent increase in focal length of 1.5x. In fact, the focal length remains the same, but the image is cropped.
DX has a greater depth of focus than 35mm, and its 1.5x crop makes, for example, a 200 mm lens behave as if it were a 300 mm lens. However, the photosites are smaller than an equivalent resolution FX, or 'full-frame' sensor, which means that it has poorer noise characteristics for the same level of technology. All Nikon dSLR cameras prior to the Nikon D3 used the DX sensor.
Lenses marked DX can only be used on DX cameras, or with FX cameras set to DX crop mode. All current Nikon F Mount lenses can be used on DX, as can the vast majority of older F mount lenses, including many manual focus lenses.
See also
Nikonians Camera - Lens compatibility chart
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