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What is the speciality about DSLR Camera? - #BESTGUIDE

Posted: 28 Dec 2015 07:00 AM PST

DSLR (Digital single-lens reflex) Camera, a very popular & beautifully crafted camera ever made. DSLR Camera is well equipped functionality & having a great photo shoot & film making too. A DSLR is digital camera combining the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film. The reflex design, light travels through the lens, then to a mirror that alternates to send the image to the either viewfinder or the image sensor. The alternative would be to have a viewfinder with its own lens, hence the term "single lens" for this design. By using only one lens, the viewfinder of a DSLR presents an image that will not perceptibly differ from what is captured by the camera's sensor.

DSLRs largely replaced film-based SLRs during the 2000s, and despite the rising popularity of mirrorless system camera in the early 2010s DSLRs remained the most common type of interchangeable lens camera in use as of 2014

Larger sensor sizes and better image quality

Drawing showing the relative sizes of sensors used in current digital cameras.

Image sensors used in DSLRs come in a range of sizes. The very largest are the ones used in "medium format" cameras, typically via a "digital back" which can be used as an alternative to a film back. Because of the manufacturing costs of these large sensors the price of these cameras is typically over $6,500 as of May 2014

"Full-frame" is the same size as 35mm film (135 film, image format 24×36 mm); these sensors are used in DSLRs such as the Canon EOS-1DX and 5D Mark III, and the Nikon D800, D4S, D610, and Df. Most modern DSLRs use a smaller sensor that is APS-C sized, which is approximately 22×15 mm, slightly smaller than the size of an APS-C film frame, or about 40% of the area of a full-frame sensor. Other sensor sizes found in DSLRs include the Four Thirds System sensor at 26% of full frame, APS-H sensors (used, for example, in the Canon EOS-1D Mark III) at around 61% of full frame, and the original Foveon X3 sensor at 33% of full frame (although as of 2013, current Foveon sensors are APS-C sized). Leica offers an "S-System" DSLR with a 30×45 mm array containing 37 million pixels This sensor is 56% larger than a full-frame sensor.
The resolution of DSLR sensors is typically measured in megapixels. More expensive cameras and cameras with larger sensors tend to have higher megapixel ratings. A larger megapixel rating does not mean higher quality. Low light sensitivity is a good example of this. When comparing two sensors of the same size, for example two APS-C sensors one 12.1 MP and one 18 MP, the one with the lower megapixel rating will usually perform better in low light. This is because the size of the individual pixels is larger, and more light is landing on each pixel compared to the sensor with more megapixels. This is not always the case, because newer cameras that have higher megapixels also have better noise reduction software, and higher ISO settings to make up for the loss of light per pixel due to higher pixel density.

Depth-of-field control

The lenses typically used on DSLRs have a wider range of apertures available to them, ranging from as large as f/1.0 to about f/32. Lenses for smaller sensor cameras rarely have true available aperture sizes much larger than f/2.8 or much smaller than f/5.6. To help extend the exposure range, some smaller sensor cameras will also incorporate an ND filter pack into the aperture mechanism. The apertures that smaller sensor cameras have available give much more depth of field than equivalent angles of view on a DSLR. For example, a 6 mm lens on a 2/3″ sensor digicam has a field of view similar to a 24mm lens on a 35mm camera. At an aperture of f/2.8 the smaller sensor camera (assuming a crop factor of 4) has a similar depth of field to that 35mm camera set to f/11.

Performance differences.

DSLR cameras often have image sensors of much larger size and often higher quality, offering lower noise, which is useful in low light. Although mirrorless digital cameras with APS-C and full frame sensors exist, most full frame and medium format sized image sensors are still seen in DSLR designs. DSLRs generally offer faster and more responsive performance, with less shutter lag, faster autofocus systems, and higher frame rates. Although some micro 4/3 cameras have frame rates that rival those of professional level DSLRs. The downside of these cameras being that they do not have an optical viewfinder, making it difficult to focus on moving subjects or in situations where a fast burst mode would be beneficial. Other digital cameras were once significantly slower in image capture (time measured from pressing the shutter release to the writing of the digital image to the storage medium) than DSLR cameras, but this situation is changing with the introduction of faster capture memory cards and faster in-camera processing chips. Still, compact digital cameras are not suited for action, wildlife, sports and other photography requiring a high burst rate (frames per second)Simple point-and-shoot cameras rely almost exclusively on their built-in automation and machine intelligence for capturing images under a variety of situations and offer no manual control over their functions, a trait which makes them unsuitable for use by professionals, enthusiasts and proficient consumers (aka "prosumers"). Bridge cameras provide some degree of manual control over the camera's shooting modes, and some even have hot shoes and the option to attach lens accessories such as filters and secondary converters. DSLRs typically provide the photographer with full control over all the important parameters of photography and have the option to attach additional accessories -mounted flash units, battery grips for additional power and hand positions, external light meters, and remote controls. DSLRs typically also have fully automatic shooting modes.

DSLRs have a larger focal length for the same field of view, which allows creative use of depth of field effects.However, small digital cameras can focus better on closer objects than typical DSLR lenses.

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Monday, December 28, 2015