The definition of DSLR Camera ( digital single-lens reflex camera) is a digital camera which apply a mechanical mirror system and pentaprism to the direct light from the lens toward the optical viewfinder behind the camera. for its basic operation, the mirror reflects the light which comes from up the lens in the 90 degree. Then, it is reflected three times by roof pentaprism, rectifying for the photographer’s eyes. During the reflection, the mirror reflects upward, narrowing aperture, open shutter, it makes any possibility for the lens to project the light toward the picture. The second shutter includes the sensor, ending the exposure, and the mirror reduces shutter. The period where mirror flipped up is called as “viewfinder blackout”. A fast action mirror and shutter are preferred in order not to delay the action picture.
A professional photographer likes DSLR because they are able to preview accurately the framing of exposure, and DSLR provide the users to choose from any others lens which is changed. Most DSLR have a function as an accurate preview in the depth of field. The most professionals prefer to use DSLR to get more sensors rather than the most compact digital. DSLR has sensors which usually closer in the size of traditional film formation which is used by professional recently. This big sensor allows for the same depth and degree of the picture for film formation, and also their high signal for
noise ratio.
Its design scheme reflects the main difference between DSLR camera and digital camera that only exposes sensor continually for the light projected by lens. It makes the camera screen to be used as an electronic viewfinder.
