Product Name: Board LensModel Number: AB20Place of Origin: ChinaFeatures: 1) Sensing area: 1/4 CCD / CMOS 2) Focal length: 2.0mm 3) Back focal length: 4.57mm 4) Max image height: 4.6mm 5) F/no: 2.0 6) Iris: fixed 7) Optical distortion: ≤39.8% 8) Lens construction: 5 components; 5 glasses 9) Field angle (diagonal): a) 138.6 (image height: 4.5mm) b) 121.2 (image height: 4.0mm) 10) Focus extent: 20cm 11) Weight: 7.0g