binocular, field, ratio: 12, the diameter of objective lens: 50 mm
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binocular, field, ratio: 10, the diameter of objective lens: 50 mm
binocular, compact, magnification: 8, diameter of objective lens: 21 mm
binocular, field, zoom, ratio: 7, diameter of objective lens: 40 mm
binocular, field, ratio: 20, the diameter of objective lens: 60 mm
binocular, multiplicity: 12, the diameter of objective lens: 25 mm
binocular, compact, magnification: 10, the diameter of objective lens: 25 mm
