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Continous Zoom 0.7x-5.0x Binocular & Trinocular Head, Zoom Ratio 1:7.1 7x-50x, Up To 3.5x-250x With Optional Eyepieces & Auxiliary Objectives High Eyepoint, Dia.30mm WF10x/22mm, WF15x, WF20x, WF25x, ...