A fast telephoto prime, Mitakon 135mm f/2.8 (II) Lens is a manual focus lens designed for full-frame and APS-C-sized DSLR cameras. Housed within a robust metal barrel, a five-element-in-four-groups design helps to realize sharp image quality while the f/2.8 maximum aperture complements working in difficult lighting and also affords greater control over depth of field for selective focus applications. 

A new ED glass has been added which has drastically reduced the chromatic aberrations.\ \The physical construction of the lens also incorporates a retractable lens hood, which serves to minimize lens flare and ghosting for contrast-rich imagery. Additionally, both depth of field and distance scales benefit the use of pre-focusing and zone focusing techniques.
 

Compared to the first generation of 135mm lenses, this 135mm 2.8 II lens has undergone an optical redesign, resulting in significant improvements in imaging quality, while reducing its size and weight. The aperture of the new lens is 9 blades, making its out-of-focus imaging more flexible and suitable for shooting large flowers and plants such as busts and sunflowers. 

This is a fully manual lens that cannot communicate with the body to transmit aperture values and auto focus.

for C-a-n-o-n mount: suitable for all models of SLR cameras, available for A-range and M-range photography. The new six generation chip features accurate exposure, accurate focus indication, and no trouble with zooming.

for Nikon mount: Nikon D7000, D7100, D200, D300, D700, D750, D800, and D810 can automatically measure light, and can take photos in A and M positions with a focus prompt. D40, D90, D3 * *, D5 * * do not have automatic light metering, and can only be photographed in M-gear with a focus prompt.

for Pentax: Suitable for all models of Pentax SLR cameras, capable of automatic light metering, with a focus prompt available for taking photos in A and M gears.

for Sony E mount, suitable for all Sony FE full frame and micro single camera.