
SLR cameras used to be a pieces of photography equipment reserved almost exclusively for the professional user group. In the last couple of years, however, digital versions have become wildly popular among common users. These "DSLRs" offer higher quality pictures at a price point aimed at the general public.
A game-changing characteristic exists in the newest breed of machines--high-definition video capabilities. Of particular note is Canon's EOS 5D Mark II, grand award winner of Popular Science's Best of What's New 2009, and the new EOS 7D.
So speaking from a videography standpoint, why do we care? Three main reasons: lenses, size and price. A DSLR is compatible with a vast number of detachable lenses, giving more flexibility to the user with focal lengths, effects, and most-importantly to many, extensive control over shallow depth of field. The physical size of the cameras is convenient, but the size of the CMOS camera sensors are the real talking point. The large imaging blocks found on the DSLRs are comparable to 35mm film cameras, giving cleaner images in low light and again, shallower depth of field. Lastly, price is a major proponent of the recent interest. With a street price of $2700 and $1700 respectively, the 5D and 7D are an incredibly affordable alternative to more traditional equipment.
Since these are primarily still cameras, the ease of use, features and workflow aren't perfect from a video perspective. Lack of extensive audio controls, a compressed file format, and an awkward body architecture do cause some caveats, but are remedied by a host of third party innovations including mounting options, uncompressed editing codecs and firmware updates.
Despite the limitations, these new DSLRs are hard at work on the sets of a variety of recent programs such as Saturday Night Live, and in the hands of industry experts like Philip Bloom. In the hands of a videographer wanting precise control of the cinematic image, these new hybrid cameras are the "new thing", and with any luck, will pave the way for future developments in cameras intended primarily for video.