The Canon CN-E 85mm T1.3 L F Cine Lens is an 85mm fixed focal length lens designed for cine-applications and capable of telephoto "looks". It comes in Canon's EF mount and is for use with Canon's EOS C300 and with full-frame EOS DSLRs.
The lens is based on Canon's EF 85mm f/1.2L II USM and is optimized for cine-use with upgraded optics and coating and a completely redesigned mechanical construction. A fast 1.3 aperture achieves superb quality in low light and a rounded 11-blade diaphragm along with the fast aperture produce strong bokeh and circular highlights. The diaphragm ring is stepless, super-smooth and totally manual, even when used with a DSLR, offering detailed handle. The lens features sharp optics capable of supporting even 4K recording quality.
The CN-E 85 was released with two complementary relatives - the CN-E 24mm and CN-E 50mm. All three lenses share the same front diameter, form factor, optical design, placement of gear rings and mechanical construction. Because of the identical characteristics, one lens can be swapped with another easily, even when geared accessories are involved.