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"  Single Lens Reflex (SLR) is a complicated term for a complicated machine. It refers to the prism and flip-up &amp;quot;reflex&amp;quot; mirror system that allows users to accurately focus and frame their shots directly through a camera&amp;#039;s optics, rather than through a separate viewfinder. Until recently, most SLRs were the province of pros, requiring experience and training to master. But the digital era has created a new, growing class of consumer-grade digital SLR (DSLR) cameras that are easier to learn and use, yet still deliver pro-level photos. These days, the most complicated aspect of DSLR cameras is figuring out which one fits your needs.   1. LCD Display Like most digital point-and-shoot cameras, digital SLRs have LCD displays--the largest of which are 3 in., diagonally. Older-model DSLRs didn&amp;#039;t let you preview your shot using the LCD. Newer cameras with &amp;quot;live view&amp;quot; functionality leave the shutter open and allow light to bypass the reflex mirror. With most of these cameras, users have to choose between framing shots with the LCD or the viewfinder. 2. Sensor DSLRs have image sensors that are 10 to 20 times the size of sensors on point-and-shoot cameras. This gives DSLRs far superior light sensitivity, which is arguably more important to overall image quality than megapixels. Most DSLR cameras can vibrate the sensor to remove dust particles that often enter the camera when changing lenses. 3. Memory CompactFlash memory cards used to be the data storage capacity kings, but the far more popular Secure Digital High-Capacity (SDHC) format now has cards with up to 32 GB, and newer DSLRs are trending toward it. 4. Battery Long battery life is critical for DSLRs, which have lots of motors and powerful flashes. Most DSLR batteries are good for a full day&amp;#039;s shooting. If you require more, we suggest you buy an extra. 5. Flash Consumer digital SLRs come with a pop-up flash. Advanced users will want to take advantage of the hot shoe, which allows the use of more sophisticated, synchronized--flash accessories.  6. Shutter DSLRs are known as fast-shooting machines, with shutter lag measured in tenths or hundredths of a second and burst modes from 2.5 to 10 frames per second.  7 Lens When you buy a DSLR, you&amp;#039;re buying part of a larger system. Most DSLRs can be purchased as a kit that includes an all-purpose zoom lens. But manufacturers also sell dozens of specialized lenses that can transform the performance of your camera. These days, lenses pack almost as much technology as the camera itself. + Autofocus It&amp;#039;s powered by the camera battery, but all the gears and motors are built into the lens. The lens interfaces have changed over the years, so many new cameras won&amp;#039;t work with old autofocus lenses. + Image Stabilization Many modern lenses come with a mechanical system that counteracts camera shake and reduces blur. On some lenses, it costs extra--but it&amp;#039;s worth it.   Price Level Price Range Good For What to Expect    BUDGET $500 to $800 The casual photographer who wants an easy-to-learn SLR. These camera kits should offer at least 10 megapixels and a 2.5- to 2.7-in. LCD screen. They are generally light on fancy features.   MIDLEVEL $800 to $1300 The advanced hobbyist who wants near-pro features. Kits in this range offer 10.2 to 12.2 megapixels and 2.7- to 3-in. LCD screens with live-view mode.    PRO $1300 to $8000 Someone who makes a living at photography. When you&amp;#039;re spending several grand, look for a &amp;quot;full-frame&amp;quot; sensor that has the dimensions of a 35 mm negative, plus &amp;quot;movie mode&amp;quot; and burst capabilities of five to 10 frames per second.   "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/technology/gadgets/how-to/a3768/4293533/>