Chinese lens manufacturer Zhong Yi Optics has announced the Mitakon 135mm F2.5. A fast, manual telephoto portrait lens for full-frame DSLR and mirrorless camera systems.

The lens is constructed of nine elements in seven groups, including two extra-low dispersion and two ultra-high refraction elements. It has a nine-blade aperture diaphragm, an aperture range of F2.5 through F22, a minimum focusing distance of 100cm (4′) and uses a 67mm front filter thread.
…
Read more