Design of CCTV lens with wide FOV and high resolution

A close circuit television(CCTV) lens was designed with a complicated reverse telephoto configuration to meet the requirements of wide field of view (FOV)and high resolution which was applied to monitor system. The FOV of the designed lens is 80,the F number is 3,the focal length is 5 mm,and the spectral range is from 486 nm to 656 nm.A 1/2 inch (1.27 cm) CCD was adopted with 7.5 m7.5 m pixel size. The modulation transfer function(MTF) of full FOV is more than 0.65 at 67 lp/mm Nyquist frequency and more than 0.85 at 1/2 Nyquist frequency, and the MTF value of FOV is more than 0.3 at 220 lp/mm, approaching to the diffraction limit. The wavefront map shows that the peakvalley (PV) value is 0.077 9 and rootmeansuare (RMS) value is 0.015 9, which can meet the Rayleigh criterion. The evaluation of optical system shows that the lens has low aberration and high image quality, satisfying the requirement of CCTV monitor system with wide FOV and high resolution.