History of snooker pool and pyramid pool. Life pool involved several colored balls used as both cue balls and object balls. In pyramid pool, there were 15 red balls and a white cue ball, and each player received one point per red ball potted. Along with the new games being developed, the table was taking steps toward its current state. Black pool was the next version created. Black pool was similar to pyramid pool, except that the black ball from life pool was added to the game and could be potted for more points. In 1875, at the British Army Officer's Mess in
Full-frame digital SLR the lens's image circle is captured. The edges are cropped off, which is equivalent to zooming in on the center section of the imaging area. The ratio of the size of the full-frame 35mm format to the size of the smaller format is known as the "crop factor" or "focal-length multiplier", and is typically in the range 1.3–2.0 for non-full-frame digital SLRs. When used with lenses designed for full frame film or digital cameras, full-frame DSLRs offer a number of advantages compared to their smaller-sensor counterparts. One advantage is that wide-angle lenses designed for full-frame 35mm retain that same wide