The samyang 500mm f80 preset if mc t mount lens has been designed for full frame or aps c cameras the t mount goes with all types of digital reflex cameras through a t2 adapter the optics comprise of 4 lens elements arranged in 4 groups with anti reflective coatings that have been used to ensure high light transmission the lens comes with a two ring aperture control system one ring adjusts the aperture value while the second closes or opens the aperture the depth of field scale has been m