This is a 2.5mm CS mount fisheye lens with a manual adjustable aperture F/# and manual adjustable focus ring. The lens provides 190° FoV at an image circle of 6.2mm. It provides a full circular image on 2/3" sensors and a full 190 degrees horizontal on a 1/2.3" sensor, such as the Raspberry Pi HQ. The fastest F/# is F/1.6.