The DPC-3 X-Pro1 -3 Diopter Correction Lens from Fujifilm is a diopter correction lens for the Fujifilm X-Pro1 digital camera. By attaching the most appropriate lens for your level of vision you can use the Hybrid Multi Viewfinder more comfortably, and for longer periods of time. The corrective lenses best suited for near-sighted photographers are those with negative values, while the opposite is true for the far-sighted, positive value corrective lenses. Each set, whether positive or negative, has a range of 1, 2 or 3 levels. The specific -3 correction value is laser etched into the lens so you always know which you're using.