Product Description 1/2" Zoom Lens for 1/3" and 1/2" CCD Cameras Focal Length 8.5-51mm Maximum Aperature Ratio F=1:1.2(wide) F=1:1.3(tele) Iris Type Automatic Image Size 6.4(H)mm x 4.8(V)mm - equivalent to 1/2" Mount Special C-Mount Dimensions (H x W x D) 2.4375'' x 3.375'' x 3.875'' Availability: Usually ships the next business day. WV-LZ81/6A