Digital SLR cameras are becoming very popular. According to a 2007 IDC report, there were about 7.5 million digital cameras sold. Canon and Nikon cameras dominated the digital SLR market, with Olympus and Sony taking up a large portion of the leftover market-share. In fact, Canon and Nikon accounted for approximately 80% of the total digital SLR camera sales, Sony and Olympus accounted for about 12%, with Panasonic and Pentax also having signific...