... ; 2)focal length:4mm; 3)aperture:1/1.8; 4)mount:M12*0.5; 1)name:day and night board lens;2 ... )focal length:4mm;3)aperture:1/1.8;4)mount ... fixed focal.There are 2.1,2.5,2.8,3.6,25,4,6,8,12,16 (mm) etc or ... on ...M.O.D of lens are 0.2,0.3,0.1,0.15(m)The mount of lens are ... then I will make a best PI for you,thanks! day and night board lens