Super Tele lens B500 • HD premium quality • Focal length: 50 mm • Aperture: f/2.5 • Image angle (horizontal x vertical): 8° x 6° (up to 5MP resolution) and 9° x 6° (6MP resolution) • For mounting this lens on the M2x, the extended replacement lens cover is needed (MOBOTIX accessory: MX-M24M-OPT-LCGL)