The ability to exchange lenses, to select the best lens for the current photographic need, and to allow the attachment of specialized lenses, is a key to the popularity of DSLR cameras.
Nikon Nikkor 18-70mm Lens
[edit] Lens mounts and lens manufacturers
Interchangeable lenses for SLRs and DSLRs are built to operate correctly with a specific lens mount that is generally unique to each brand. A photographer will often use lenses made by the same manufacturer as the camera body (for example, Canon lenses on a Canon body) although there are also many independent lens manufacturers, such as Sigma,[5] Tamron,[6] Tokina,[7] and Vivitar,[8] to name a few, that make lenses for a variety of different lens mounts. There are also lens adapters that allow a lens for one lens mount to be used on a camera body with a different lens mount, but with reduced functionality.
Many lenses are mountable, “diaphragm-and-meter-compatible,” on modern DSLRs and on older film SLRs that use the same lens mount. For more information see Mount compatibility across camera generations.
Most DSLR manufacturers have introduced lines of lenses with image circles and focal lengths optimized for the smaller sensors generally offered for existing 35mm mount DSLRs, mostly in the wide angle range. These lenses tend not to be completely compatible with full frame sensors or 35mm film.
Several manufacturers produce full-frame digital SLR cameras that allow lenses designed for 35mm-size “full frame” sensors to be used at their full designed focal length.
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