Digital Camera lens : Now accept the best for yourself

Perhaps one of the most confusing in the world of digital cameras is the length of the lens. Heard expressions like "TV", "Wide Angle", "field of vision", "5 times" and a host of others to describe our goals. Then once all the business we have determined that the crank other mysterious phrases like "crop factor" and "35 mm equivalent." No wonder it's hard to decide on a target?