The sony 85mm f28 sam lens is a light compact full frame prime lens that is ideal for portraits on full frame cameras and great for general purpose mid telephoto applications on cameras with aps c sized sensors where it provides an angle of view equivalent to a 1275mm focal length lens it provides clear sharp corner to corner imaging even at maximum aperture where the circular aperture design creates beautiful defocus effects the sony 85mm f28 sam lens features a smooth autofocus motor