... :1/1.8; 4)mount:M12*0.5; 1)name:day and night board lens;2)focal length:4mm;3)aperture:1/1 ... focal auto iris lens,board lens,anto iris Monofocal lens(Video)auto iris monofocal lens(DC)etc. As to the fixed ... .6,1/1.7,1/1.8,1/2.0 and so on ...M.O.D of lens are 0.2 ... of lens are CS,M12*0.5The weight to different camera lens are different Any one interesting to you,please contact ...