Providing adjustment for differing prescriptions, the Fujifilm Diopters are designed to fit the X-Pro1 perfectly and simply screw in to place of the diopter supplied with the camera. High quality glass ensures viewing quality is maintained. The diopters are available in 6 different powers (+3, +2, +1,0, -1, -2, -3) and have the power laser etched on to the glass for easy reference.