... /1.8; 4)mount:M12*0.5; 1)name:day and night board lens;2)focal length:4mm;3)aperture:1/1.8;4 ... iris lens,monofocal manual iris lens,monofocal auto iris lens,Manual vari focal manual vari focal lens,Manual vari focal auto iris lens,board lens,anto ... .7,1/1.8,1/2.0 and so on ...M.O.D of lens are 0.2,0.3,0.1 ...