... ,clear image,all-metal lens2.Fixed focal length 35mm,1/2 inch,C-mount,F1.7 aperture ... glass.Specification: Model NumberABF-F3517M-1Focal Length(mm)35mm Aperture(F)1.7Format(inch)2/3MountCAngle of View18MOD ... monofocal manual iris lens serie: (6mm,12mm,25mm,35mm,50mm)ABF fixed focus auto iris lens series: ( ... 6mm,8mm,12mm,16mm) Certificate: New design monofocal 35mm FA lens F1.7 manual iris c mount cctv ...