This 8mm manual focus wide angle fisheye cine lens from samyang is designed for digital cameras with an aps c image sensor the focus gear ring allows for a follow focus system and with distance scales marked on both sides and an uncoupled aperture gear ring the aperture can be precisely and quietly adjusted to ensure a smooth jump free transition for professional looking video the t number t38 t22 represents the actual light transmission and at t38 you are able to capture natural atmosp