This Tamron varifocal CS mount lens with DC-Iris has a focal length of 2.8 - 13 mm and the fast aperture (F-number) is F1.4. It supports cameras with up to 5 megapixels and is included in AXIS M1137 and AXIS M1137-E Network Cameras. The lens is compatible with all cameras from AXIS M11 Network Camera Series.