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4K Resolution Lens 1.21mm Fisheye Lens 220 Degree IR 1/2.3 Inch 16MP M12 Mount for 360 VR Gopro Hero 3/4 Xiaomi Yi Image size: 1/2.3inch φ4.3mm Focal length: 1.21mm±5% Aperture: 2.5mm±5% Field of View...