Specifications:

Brand : Canon
Is Discontinued By Manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 38.3 x 14.6 x 14.6 cm; 3.19 kg
Date First Available ‏ : ‎ 7 August 2012
Manufacturer ‏ : ‎ canon
ASIN ‏ : ‎ B004M8SWB0
Item model number ‏ : ‎ 5124B002
Country of Origin ‏ : ‎ China
Manufacturer ‏ : ‎ canon
Item Weight ‏ : ‎ 3 kg 190 g
Item Dimensions LxWxH ‏ : ‎ 38.3 x 14.6 x 14.6 Centimeters
Focal Length 500mm
Maximum Aperture f/4
Minimum Aperture f/32
Lens Mount Canon EF
Lens Format Coverage Full-Frame
Angle of View 5°
Minimum Focus Distance 12.14′ / 3.7 m
Maximum Magnification 0.15x
Optical Design 16 Elements in 12 Groups
Diaphragm Blades 9, Rounde
Focus Type Autofocus
Image Stabilization Yes
Tripod Collar Removable and Rotating
Filter Size 52 mm (Drop-In)
Dimensions (ø x L) 5.75 x 15.08″ / 146 x 383 mm
Weight 7.02 lb / 3.18 kg

Features:

Super telephoto prime is designed for full-frame Canon EF-mount DSLRs, however can also be used with APS-C models where it provides an 800mm equivalent focal length.

Bright f/4 maximum aperture affords control over depth of field for working with selective focus techniques.

Two fluorite elements are used to greatly reduce color fringing and chromatic aberrations in order to achieve greater clarity and color accuracy.

Four aspherical elements help to limit spherical aberrations and distortion for greater sharpness and accurate rendering.

A Sub Wavelength Coating has been applied to individual elements to control lens flare and ghosting for greater contrast and color fidelity when working in strong lighting conditions.

An Optical Image Stabilizer helps to minimize the appearance of camera shake by up to four shutter speed stops to better enable working in low-light conditions and with slower shutter speeds. Three distinct IS modes are available: standard single-shot mode, a panning-optimized mode, and a mode that only activates the Image Stabilizer during the exposure.

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.
Focus Preset function is available to quickly recall a programmed focusing position.

Focus Limiter switch lets you constrain the focusing to three different ranges to suit different applications: 12.1-32.8′, 12.1′-infinity, or 32.8′-infinity.

A Power Focus setting is available, and allows you to electronically and smoothly adjust your focus position to suit video recording. This setting utilizes a dedicated ring in front of the main focusing ring and allows you to use one of two different focusing speeds.

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.