USM telephoto lens

Canon has announced the release of the RF 135mm F1.8 L IS USM, a telephoto prime lens with image stabilization. The telephoto prime is constructed of 17 elements in 12 groups, including three Ultra-low Dispersion (UD) elements. It has a minimum focusing distance of 70cm (27.6″), uses a nine-blade aperture diaphragm and has an 82mm front filter thread. The lens uses Canon’s Air Sphere…