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SARS Technologies - What Security Camera Lens Size is Best? The security camera lens size, or focal length, measured in mm, determines the field of view. This is also called the viewing
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3.7mm M12 Button Lens M12 Mount, 1.3 Megapixel 80degree Horizontal Viewing Angle F2.0 fixed Iris for CCTV Cameras - Walmart.com
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