ModelNoSL08551ImageFormatCover1/3"1/2"FocalLength8.5-51.0mmMaximumApertureRatioF1.2-CIrisControlMethodManualFocusControlMethodManualZoomControlMethodManualAngleFieldofView(D×H×V)1/3inchWide31.3°×23.6°Tele5.5°×4.1°1/2inchWide41.2°×31.3°Tele7.2°×5.5°2/3inchWide***Tele***1inchWide***Tele***MinimumObjectDistanceBackFocalLengthEffectiveDiameterFrontRearFilterScrewSizeMountCMechanicalDimension(D×L)Φ58.8X93.4Weight440gComments)