Olympus was the first to include a dust reduction system on a DSLR, featuring their "Supersonic Wave Filter" (SSWF) dust reduction technology on the Olympus E-1 in 2003.
This song was used in world's first DSLR Full-HD movie "Reverie" by Vincent Laforet and is also included on disc one of the American release of Go – The Very Best of Moby.
Kodak DCS - May 1991, later called DCS 100, first commercially available DSLR camera, Nikon F3 based body.
The Sony Alpha a550 is "big brother" to the Sony Alpha a500, an almost identical DSLR with a smaller 12.3 megapixel APS-C CMOS sensor, no 7frame/s continuous shooting and a lower resolution LCD.