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A DSLR with this feature is often known as an HDSLR or DSLR video shooter.The first DSLR introduced with an HD movie mode, the Nikon D90, captures video at 720p24 (1280x720 resolution at 24 frame/s).A digital single-lens reflex camera (also called a digital SLR or DSLR) is a digital camera that combines the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film.The reflex design scheme is the primary difference between a DSLR and other digital cameras.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.They often include landscape, portrait, action, macro, night, and silhouette, among others.However, these different settings and shooting styles that "scene" mode provides can be achieved by calibrating certain settings on the camera.
To take an image, the mirror swings upwards in the direction of the arrow, the focal-plane shutter (3) opens, and the image is projected and captured on the image sensor (4), after which actions, the shutter closes, the mirror returns to the 45-degree angle, and the built in drive mechanism re-tensions the shutter for the next exposure.
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.
A movable mechanical mirror system (2) is switched down (exact 45-degree angle) to direct light from the lens over a matte focusing screen (5) via a condenser lens (6) and a pentaprism/pentamirror (7) to an optical viewfinder eyepiece (8).
Most of the entry-level DSLRs use a pentamirror instead of the traditional pentaprism.