The Computar CS-Mount 12.5-50 mm f/1.4 Varifocal IR-Corrected Telephoto Lens with P-Iris from Axis Communications is recommended for use with the AXIS P1355, P1355-E, P1357, and P1357-E Network Cameras. The lens is day/night corrected and therefore, no adjustments will be needed when the IR-cut filter of the day/night camera on which it is installed disengages.