Canon EF 70-300mm f/4.5-5.6 DO IS USM Lens
The Canon EF 70-300mm f/4.5-5.6 DO IS USM Lens is a relatively compact telephoto zoom offering superior maximum-aperture performance across its entire focal length range. It incorporates Canon's DO (Diffractive Optics) and IS (Image Stabilizing) technologies.
The use of Diffraction Optics allows a lens to be shorter, lighter, and of higher image quality than comparable normal optical systems of the same focal length and aperture-while this lens is heavier than the consumer-grade EF 70-300mm f/4-5.6 IS USM lens, it is 28% shorter and uses Canon's very best ring-USM motor instead of the lighter, slower, and less costly 'micro-USM' motor.
Beyond savings in mass, the DO lens performs admirably at its maximum aperture, with images that are very comparable to the "L" series telephotos. It has a circular aperture diaphragm to help create natural out-of-focus highlights, and its built-in image stabilizer allows you to handhold the lens at shutter speeds 3 steps slower than would otherwise be possible.
The lens' AF is super-fast and silent with a ring-type USM that focuses down to 4.6', and features a zoom lock button that keeps the lens safe and secure when not in use or when being used at the shortest 70mm focal length setting. The EF 70-300mm f/4.5-5.6 DO IS USM is an ideal lens for sports, portraiture, animals, and other applications when you're shooting in relatively bright light.

Canon EF 70-300mm f/4.5-5.6 DO IS USM Lens
Performance
Focal Length - 70 - 300 mm
Aperture Maximum: f/4.5 - 5.6
Minimum: f/32 - 40
Camera Mount Type - Canon EF
Format Compatibility - 35mm Film / Full-Frame Digital Sensor
Canon (APS-C)
Angle of View - 34 - 8 Degrees
Minimum Focus Distance - 4.60' (1.40 m)
Magnification - 0.19x
Maximum Reproduction Ratio - 1:5.2
Groups/Elements - 12/18
Diaphragm Blades - 6

Features
Image Stabilization - Yes
Autofocus - Yes
Tripod Collar - No

Physical
Filter Thread - 58 mm
Dimensions (DxL) - Approx. 3.2 x 3.9" (8.13 x 9.91 cm)
Weight - 1.58 lb (720 g)