SIGMA 300-800mm F5.6 Ex DG HSM for Canon

From 300mm telephoto to 800mm ultra-telephoto this new lens provides a constant fast maximum aperture and is optimized for digital SLR cameras. An ultra telephoto as no other camera or lens manufacturer offers the serious photographer! Featuring a constant aperture of F5.6 throughout the entire zoom range, this lens is ideal for photographing wildlife when there is no way of controlling the distance of the animal to the camera. With a simple turn of the zoom ring, the photographer can instantly adjust the composition of the image without moving or disturbing the subject. Similarly, the zoom accommodates sporting photography such as football or surfing where the rapidly changing distance of the action requires massive changes in focal length in a matter of seconds. The new Super Multi Layer (SML) anti-reflective coating and lens design reduce flare and ghost, which is a common problem with digital cameras and also creates an optimum colour balance.

The internal focusing system ensures the overall length of the lens does not change during focusing, ensuring convenient handling and ease of use. The Hyper Sonic Motor (HSM) ensures an ultra-quiet, high-speed autofocus as well as full-time manual focusing capability, making it possible to manually focus without leaving AF mode. The lens has an adjustable focal length of 300 to 800 mm and a f / 5.6. It was designed for both digital and conventional SLRs with a compatible bayonet.

A 46mm filter can be inserted near the rear of the lens, and a circular polarising filter (included) can be used in situ. A heavy duty tripod bush is included as standard for use with tripods and monopods. Multiple threaded holes (1/4 "and 3/8" standard screws) allow accurate balancing of lens and camera body. This is also designed as an easy grip when carrying the lens.

In manual focus mode, it is compatible with Sigma 1.4x and Sigma 2x converters.  Also included is a removable sun visor. 

Parameters and Specifications:
Designed for cameras:
Canon
Focus:
HSM (ultrasonic micromotor)
Lens Luminance:
F / 5.6 (minimum f / 32 aperture)
Focal distance:
70 - 300mm
Lens Construction:
18/16 (number of lenses / number of groups)
Viewing Angle:
8.2° -3.1°
Minimum focusing distance:
600cm
Display Ratio:
1: 6.5
Diameter of filter thread:
46mm (rear filter)
Dimensions (diameter x length):
165.5 x 541.5mm
Weight:
5.73kg
Colour:
Black
Accessories:
Sun visor