General Specifications Lens Model Name YJ19x9B ITS Application 2/3" Remote Control Zoom Ratio 19x Built-in Extender 2.0x Range of Focal Length (With extender) 9~171mm 18~342mm (2.0x) Maximum Relative Aperture (With Extender) 1:1.8 at 9~114mm 1:2.7 at 171mm 1:3.6 at 18~228mm (2.0x) 1:5.4 at 342mm (2.0x) Angular Field of View (With Extender) 4:3 Aspect Ratio (6.4 x 4.8mm) 52.1 x 40.3 at 9mm 2.97 x 2.22 at 171mm 27.5 x 20.8 at 18mm (2.0x) 1.47 x 1.11 at 342mm (2.0x) Minimum Object Distance (M.O.D.) 0.9m (50mm with Macro) Object Dimensions at M.O.D. (With Extender) 4:3 Aspect Ratio (6.4 x 4.8mm) 78.9cm x 59.2cm at 9mm 4.3cm x 3.2cm at 171mm 39.5cm x 29.6cm at 18mm (2.0x) 2.2cm x 1.6cm at 342mm (2.0x) Macro Yes Size (W x H x L) 122.5 x111.8 x 198.6mm Mass (Approx.) 1.53kg (3.37lbs)