This Tamron varifocal 8 megapixel CS mount lens has a focal length of 8 - 50 mm and the fast aperture (F-number) is F1.6. The P-Iris lens is IR corrected and specially made for cameras with support for P-Iris technology. The lens supports cameras with up to 8 megapixels and is compatible with selected cameras from AXIS P13 and AXIS Q16 Network Camera Series.