Computar 12.5-50 mm P-Iris

With its P-iris capabilities, this lens addresses the imperfections of an auto-iris lens by providing improvements in contrast, clarity, resolution, and depth of field. The long reach of this telephoto lens allows you to capture objects that are far away.  

The lens is IR-corrected. This means that you don't need to adjust the camera's focus when you shift between day and night mode using the IR-cut filter.