The LCM-12MP varifocal series are ultra high resolution (up to 12MP) lenses designed for cameras with a 1" sensor or smaller, to create sharp images. The low F number makes it a very light sensitive lens, ideal for low illumination situations due to short exposure times or poor light conditions. It's a varifocal lens, therefore you can mechanically zoom in / zoom out to have the right field of view in every circumstance. The iris and focus are adjustable and can be fixed by a screw.