This is a manual lens. It works on both "full frame" cameras as well as the "APS-C" style digital SLR cameras. You can only use the lens in "M" manual exposure mode.

A highly practical medium telephoto lens with superb delineation and portability, the Opteka 85mm lens produces sharp and clear images at all apertures. Employing a re-designed optical system that includes Opteka's exclusive HD super multi coating, the 85mm f/1.8 inherits its predecessor’s ultra-fast f/1.8 maximum aperture and rounded six-blade diaphragm for superior depth-of-field control and background blur (bokeh). Engineered to inspire new levels of creativity and artistry, the Opteka 85mm f/1.8 will unleash the full potential of your digital camera in the studio or in the field. And because the front lens group does not rotate during focusing, special filter effects are not affected. Best of all, the standard zoom lens with its natural angle of view and perspective, captures the subject plainly, making it excellent for portraits and images that require a natural depth of field.

One of the advantages of the Opteka 85mm is its build quality. The materials are glass and metal, there is no plastic used in this lens. It deliberately does not contain any electronics. It is 100% manual. The less parts it has, the less chances that something will break down.

Due to this lens only being produced in a Canon EOS or Nikon mount, a EOS to Sony E adapter is included. This all-metal adapter allows you to attach any manual-focus Canon lens to your Sony E-mount camera.

Specifications
Lens Construction: 10 Elements in 7 Groups
Angle of View: 28.5 Degrees
Filter Size: 55mm
Lens Hood: Yes; screw in
Aperture Range: F1.8 ~ 22
Minimum Focusing Distance: 2.78 ft / 0.85m
Length: 70mm / 2.7 in.
Weight: 13.4 oz (380g)
Warranty: 5 Years.