Specifications:

Brand Canon
Focal Length 85mm
Aperture Maximum: f/1.4
Minimum: f/22
Camera Mount Type Canon EF
Format Compatibility 35mm Film / Full-Frame Digital Sensor
Angle of View 28° 30′
Minimum Focus Distance 2.79′ (85 cm)
Magnification 0.12x
Maximum Reproduction Ratio 1:8.33
Optical Design 14 Elements in 10 Groups
Diaphragm Blades 9, Rounded
Image Stabilization Yes
Autofocus Yes
Filter Thread Front: 77 mm
Dimensions (DxL) Approx. 3.49 x 4.15″ (88.6 x 105.4 mm)
Weight 2.09 lb (950 g)
Package Weight 1.25 kg
Box Dimensions (LxWxH) 8.25 x 5.5 x 5.5″

Features:

Portrait-length prime is designed for full-frame Canon EF-mount DSLRs, however can also be used with APS-C models where it will provide a 136mm equivalent focal length.

Notably fast f/1.4 maximum aperture offers extensive control over depth of field for working with selective focus techniques. This bright design also benefits working in low-light conditions.

One glass-molded aspherical element helps to reduce distortion and spherical aberrations for improved sharpness and clarity.

An Air Sphere Coating (ASC) has been applied to lens elements to reduce backlit flaring and ghosting for maintained light transmission and high contrast in strong lighting conditions.

A ring-type Ultrasonic Motor (USM), along with optimized focusing algorithms and a high-speed CPU, is employed to deliver fast, precise, and quiet autofocus performance as well as full-time manual focus override.

Optical image stabilization minimizes the effects of camera shake by compensating for up to four stops of shutter speed.

Rounded nine-blade diaphragm contributes to a pleasing out of focus quality that benefits the use of shallow depth of field and selective focus techniques.