Camera An optical instrument that records images.
A camera is an optical instrument that records images that can be stored directly, transmitted to another location, or both. These images may be still photographs or moving images such as videos or movies. The term camera comes from the word camera obscura (Latin for "dark chamber"), an early mechanism for projecting images.
Types of cameras : Still camera : a device used to take photographs. Instant camera : a type of camera with selfdeveloping film Digital camera : an electronic device used to capture and store photographs electronically. Video camera : a portable electronic device for recording video images and audio onto a storage device. Camcorder : a portable video camera used by consumers. Closedcircuit television camera : is used for surveillance that is generally fixed, with the exception of being able to swivel. Professional video camera : is used in commercial television production that may or may not be mobile. Virtual camera : in computing and gaming. Range cameras : which produce images of the distance to each point in the scene. Ultrasonography uses ultrasonic cameras that produce images of the absorption of ultrasonic energy. Magnetic resonance imaging is sometimes called a MRI camera which produce images showing, internal structure of different parts of a patient's body.
SLR DIGITAL CAMERA
A singlelens reflex (SLR) camera is a camera that typically uses a mirror and prism system (hence "reflex", from the mirror's reflection) that permits the photographer to view through the lens and see exactly what will be captured, contrary to viewfinder cameras where the image could be significantly different from what will be captured.
Advantage of digital SLR cameras – Photo Quality Many compact cameras these days have a huge number of megapixels. More in fact than a lot of digital SLRs. You could be forgiven for thinking that this must mean better photos? Unfortunately you'd be wrong. More megapixels doesn't equal better quality. The problem is the image sensors on compact digital cameras are just too small. When 10 million pixels are crammed onto them the individual photosites on the sensor are too small, and too close together.
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Slr digital camera