 Even at the fastest speed, the time taken to make a complete exposure is measured in seconds or minutes, because even though the "shutter speed" could be 1/1000 s, it has to be taken literally thousands of times.This makes it very inappropriate for moving subjects, such as sports, nature, or city life, and is practically restricted to still life, art reproduction, and landscapes.Another downside is that most of these backs have to be used tethered to a computer.