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Excerpt: First and foremost, the lens can be shifted up or down by up to 11.5 millimetres. The upward shift is commonly referred to as 'rise', whereas the downward shift is called 'fall'. A large knob, coupled to a worm drive mechanism, is used to shift the lens while a smaller locking knob on the opposite side of the lens allows you to lock the lens in the desired position. Next to the shift control knob is a scale marked in 1mm increments.