Magnification (fold): 7 to 21 Actual field of view (°): 4.3 to 2.3 Shouldest focusing distance (m): 7 Eye relief (mm): 12 to 9 An effective diameter of objective lens (mm): 21 Coating: Multicoat Apparent field of view (°): 29.4 to 45.7 Field of view (m): 75到40 瞳孔直径(mm):3至1 亮度(LM):9至1