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Digital - Best Rated Digital SLR Camera Reviews

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Digital Slr Means

Digital SLR refers to a single-lens reflex (SLR) camera that uses electronic image sensors to convert the energy of "particles" of light (or photons) into corresponding electrical pulses. Instead of a roll of film that chemically stores images formed by a photo-chemical reaction, image sensors simply convert electromagnetic energy (the moving photons) into electrical energy (moving electrons) via the photo-electric effect. The (analog) information thus converted is “sampled” or "filtered" by an analog-to-digital converter (digitized) and then stored in digital format onto a dedicated memory device. In contrast to non-SLR digital cameras, SLR digital cameras (or digital SLR cameras) use a mechanical swiveling-mirror system, coupled with a reflecting prism (pentaprism or porro prism) or another set of mirrors (pentamirror), that allows the camera operator to see directly the exact image that will be recorded by the sensor (or film) immediately before activating the shutter. The SLR system in most digital SLR cameras is very similar (or even identical) in operation to the SLR system in older (analog) SLR cameras (which first appeared in 1884 ). Almost all the latest SLR cameras (digital or analog) have interchangeable lenses.

Dslr Slr

Digital single-lens reflex (or SLR) refers to the design of a camera viewfinder system that allows the operator to use only one lens system to (1) view and frame a scene, and to (2) record the same scene onto a film or image sensor. Before taking the shot, the scene is projected onto the viewfinder by a combination swiveling-mirror and prism system. During the shot, the mirror moves upward and the light from the scene directly strikes the film or the image sensor which then records and stores that scene. During the time (measured in milliseconds) that the mirror has moved out of the way, the scene is not visible through the viewfinder.

Digital Slr Stands For

Digital SLR stands for digital single-lens reflex. The phrase is applied to a camera that has both a single-lens-reflex viewfinder system, and an electronic device--usually either a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS)--that acquires an analog image of the scene which is then converted and stored in binary (0's and 1's) digital format. Film-based (or analog) SLR cameras became common in the 1970s; and digital cameras, in the 1990s. The digital SLR cameras are now the de facto equipment of choice for almost all professional and "serious" amateur photographers. The main advantage of digital SLRs against film-based (analog) SLRs is the convenience of not having to chemically process rolls of "negative" film and sheets of "positive" prints—a procedure that usually takes a lot of time and is susceptible to a number of variables (e.g., temperature, humidity, amount of suspended dust in the air, etc.) that affect the quality of the final printed image.

Buying Guide Digital Slr Camera

Digital SLR cameras are categorized mainly according to (1) image resolution and quality, and (2) the availability of a number of additional features that make it easier to frame a picture or that allow the operator to manually or automatically choose among many possible combinations of exposure settings. Usually the higher the maximum possible resolution and image quality and the more features a camera has, the higher its price will be. There are numerous websites that offer guidance and provide information about the many different types and brands of digital SLR cameras. The latest popular features include the ability to shoot high-definition digital movies just like a conventional (and usually cheaper) digicam and the ability to view the the scene on an electronic display, again just like a conventional (non-SLR) digital camera.

Digital Slr Camera Rankings

There are no commonly accessible extensive and strictly objective evaluative data that compares and contrasts the relative performance of the most popular brands of digital SLR cameras. Performance and quality are usually judged based on the components and features of the camera. For example, the sensor type and design partly determines the available frame rate and number of ISO settings. There are basically two common types of sensors: CCD or CMOS, with CMOS generally regarded as being faster when it comes to transferring the image onto the image processing system, thereby allowing faster shutter cycle rates (that is, the operator can shoot a higher number of frames per second). The sensor size (e.g., "full frame", "medium", Four Thirds, Foveon, 1/1.7", 1/1.8", 1/2.5", etc.) affects the resolution, "crop factor" and overall image quality. The "megapixel count" (although not an exact indicator) is an adequate measure of resolution for most recreational photographers. The lens quality also affects the overall image quality (the lower the optical aberration, the sharper the image). Image quality, in turn, is defined by such factors as sharpness (opposite of blurring), amount of digital noise, dynamic range, color accuracy, etc. In addition to the standard ability to set the aperture size, ISO setting, filter effects, lens type, and so on, most digital SLR cameras now include some, most, or all of the following features: HD (high-definition) video mode, "live preview", image stabilization or "steady shot", "face capture", quick autofocus, all-around weatherproofing, and dust reduction systems (while changing lenses). The most popular brands of digital SLR cameras are Japanese and include Canon, Nikon, Sony, Olympus, and Pentax.
 


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