binocular, field, ratio: 8, diameter of objective lens: 50 mm
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telescope, field, ratio: 20, the diameter of objective lens: 80 mm
telescope, field, ratio: 20, the diameter of objective lens: 60 mm
telescope, field, ratio: 9, the diameter of objective lens: 50 mm
telescope, field, ratio: 20, the diameter of objective lens: 50 mm
telescope, field, ratio: 10, the diameter of objective lens: 50 mm
telescope, field, ratio: 20, the diameter of objective lens: 70 mm
monocular, field, ratio: 10, the diameter of objective lens: 50 mm
monocular, field, ratio: 18, the diameter of objective lens: 70 mm
