Full-Frame vs. Small-Frame Digital (Does It Matter?)

Digital sensors come in a variety of sizes. Is bigger better?
Like film cameras, digital SLRs come in a wide range of formats. But with D-SLRs, the format is based on the size of the image sensor, not on the size of the film. Sensor size has several ramifications for the photographer. First, larger sensors cost a lot more than small ones, in part because of the difficulty in manufacturing them. Second, larger sensors "see" more of the image formed by a lens and thus provide a wider field of view with any given focal length. Third, for a given pixel count, larger sensors contain larger pixels, which, all other things being equal, collect light more efficiently for better low-light and high-ISO performance. Finally, larger sensors generally require larger camera bodies.

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