Professional photographers usually select their cameras from four major types including view cameras, viewfinder cameras, single (SLR) or twin lens reflex (TLR) cameras. These days the digital cameras with even more advanced features have already replaced professional film cameras. Some digital cameras have many fantastic features and capabilities, and can store hundreds or even thousands of high resolution images. Single lens reflex (SLR) digital cameras are the most used by professional photographers.
SLR professional digital cameras deliver high resolution, best-of-class optics, automatic and wide-range manual controls. There are many brands of high-quality SLR digital cameras. The top quality cameras are Canon EOS 50D, Canon Digital Rebel XS, Nikon D300, Sony Alpha A350, Olympus Evolt E-420 and Pentax K10D. These cameras have the range of resolution between 6 to 14 mega pixels. All of these cameras have advanced features such as auto and manual focus and exposure, JPEG and RAW file formats, up to 3.0-inch live view LCD display, etc.
SLR cameras completely exclude the parallax error typical to viewfinder cameras, because the same lens is used for both viewfinder and camera. You are taking exactly the same picture that you see in viewfinder. SLR digital cameras support uncompressed image formats such as RAW, TIFF and traditional standard JPEG format. SLR cameras are an ideal tool for photographers using image editing and enhancing software to optimize images. A twin lens reflex (TLR) camera is a kind of hybrid of SLR and viewfinder. There is no digital TLR type professional camera commercially available.

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