... 2)focal length:2.5mm; 3)aperture:1/2.0; 4)mount:M12*0.5; 1)name:board lens;2)focal length:2.5mm;3)aperture:1/2 ... .As to the fixed focal.There are 2.1,2.5,2.8,3.6,25,4,6,8, ... requirement.The aperture of lens are 1/1.2,1/1.4,1/1.6,1/1. ... on ...M.O.D of lens are 0.2,0.3,0.1,0.15(m)The mount ... As to the fixed focal.There are 2.1,2.5,2.8,3.6,25,4,6,8,12 ... requirement.The aperture of lens are 1/1.2,1/1.4,1/1.6,1/1. ...