The General Electric 12.5mm High Resolution Manual Iris Lens for 1/2" Format Sensors is designed to work for cameras featuring megapixel sensors. Designed primarily for 1/2" sensors, the lens can also work with 1/3" sensors to offer high resolution image reproduction. A wide aperture of f/1.2 makes the lens suitable for low-light surveillance. You can manually adjust the iris setting in accordance with available light intensity.