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(Digital Single Lens Reflex) A digital still image camera that uses a single lens reflex (SLR) mechanism. Most professional cameras were analog single lens reflex until digital SLRs emerged in the early 1990s. Following are the two major advantages of DSLRs.

Removable Lenses
No single lens can handle every photographic requirement, and SLR cameras have always used removable lenses. A wide variety of lenses are available for each camera system, and many lenses that fit 35mm film SLRs also fit DSLRs. However, the CCD or CMOS sensor in all but high-end DSLRs is generally not as large as a 35mm frame, and 35mm lenses produce different focal lengths (see crop factor). See CCD sensor and CMOS sensor.

Through the Lens
In an SLR, the photographer sees the image through the actual picture lens. To compose the picture, a mirror reflects the light from the lens to the viewfinder. When the picture is taken, the mirror momentarily flips out of the way to allow the light to pass through the lens diaphragm to the CCD or CMOS sensor (or to film in analog SLRs). Through-the-lens viewing enables precise manual focusing. See mirrorless camera, viewfinder, digital camera and Four Thirds system.

Beware the Dust!
Unlike an analog SLR, which uses a fresh film frame for each photo, the DSLR uses the same sensor chip forever. Because the sensor is susceptible to dust, it is imperative to always keep the lens port covered when no lens is attached. Starting in 2007, DSLRs began to include automatic dust removal. A "mirror lockup" function flips the mirror out of the way to expose the sensor for cleaning, and there is a raft of cleaning materials on the market. For a comprehensive overview, visit www.cleaningdigitalcameras.com.

Holding a DSLR
In addition to the LCD screen, DSLRs also have viewfinders, which helps photographers hold the camera steady when pressed against the face, especially with large lenses as in this example. (Image courtesy of Canon Inc., www.canon.com).
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References in periodicals archive ?
Dubai: Camera makers are hoping to cash in on the growing demand for mirrorless devices and boost sales as demand for DSLRs is falling.
DSLRs took so much from SLRs to the point that they share lenses and flash units.
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Added Value Features: DSLRs can offer a wide array of value added features, so it is always worth remembering what you hope to get out of your photography before investing in additional technology features.
DSLR cameras may soon be superseded by another advance: the Mirrorless Reflex Camera.
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Both courses are suitable for beginners or those with a little knowledge of DSLR shooting and editing but who want to learn more.
Canon EOS 1200D with 18-55 mm lens PS439.99 from currys.co.uk TO coincide with the launch of this new model, the folk at Canon have released an EOS companion app to help get beginners through their first DSLR experience.
The spec sheet will possibly make more experienced types scoff but, for firsttime DSLR users, the 1200D marks an ideal introduction, particularly when you factor in the excellent companion app.
However, not everyone has DSLR cameras but often smartphones or small cameras are used instead.
The LighTri-312 DL is stylish, functional lightweight, protective Torso-Pack designed for a small DSLR with lens attached, plus up to 2 additional lenses and accessories, OR a Micro HDV camcorder with accessories.