Focal Length f = 2.8mm Aperture Ratio 1 : F1.2 ~ 360 DC Auto Iris, Aspherical IR Lens, 1/3" Format Camera, Megapixel Lens Focal Length Image Format Fixed Iris Manual Iris Aspherical IR lens f=2.8mm 1/3"     SCVM028ASIR f=2.8~8.2mm      SCVM2882DIR f=4.0mm  1/2"   SCVHM04FASIR     f=8.0mm      SCVHM08DIR f=4.0~12.0mm     SCVHM4012MASIR  SCVHM4012ASIR f=4.0~8.0mm     SCVHM408MASIR  SCVHM408ASIR