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By using only one lens, the viewfinder of a DSLR presents an image that will not differ substantially from what is captured by the camera's sensor.
A DSLR differs from non-reflex single-lens digital cameras in that the viewfinder presents a direct optical view through the lens, rather than being captured by the camera's image sensor and displayed by a digital screen.
These lenses tend not to be completely compatible with full frame sensors or 35 mm film because of the smaller imaging circle and, with some Canon EF-S lenses, interfere with the reflex mirrors on full-frame bodies.
Since 2008, manufacturers have offered DSLRs which offer a movie mode capable of recording high definition motion video.
In the reflex design, light travels through the lens, then to a mirror that alternates to send the image to either the viewfinder or the image sensor.
The traditional alternative would be to have a viewfinder with its own lens, hence the term "single lens" for this design.
Professional DSLRs seldom contain automatic scene modes as professionals often do not require these and professionals know how to achieve the looks they want.
Most of the entry-level DSLRs use a pentamirror instead of the traditional pentaprism.
Phase-detection autofocus is typically faster than other passive techniques.
As the phase sensor requires the same light going to the image sensor, it was previously only possible with an SLR design.
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 often reduced functionality.
Many lenses are mountable, "diaphragm-and-meter-compatible", on modern DSLRs and on older film SLRs that use the same lens mount.
Interchangeable lenses for SLRs and DSLRs (also known as "Glass") are built to operate correctly with a specific lens mount that is generally unique to each brand.