Information Engineer

This compact and lightweight EF 75-300mm telephoto zoom lens is ideal for shooting sports, portraits, and wildlife. The lens is distinguished by a newly developed micro ultra-sonic monitor (USM) that makes autofocusing quicker and quieter, along with an improved zoom mechanism that includes a silver ring on the front for a luxurious touch. The micro USM makes this version of the lens particularly suitable for applications that require a fast autofocus, such as sporting events or wildlife shoots. Best of all, the USM version shares many of the same features that makes the non-USM lens so popular, such as a compact size, a close focusing range, and accessory compatibility. As with all Canon lenses, this unit carries a one-year warranty.

* Focal length: 75-300mm
* Maximum aperture: 1:4.5-5.6
* Lens construction: 13 elements in 9 groups
* Diagonal angle of view: 32 degrees (at 11 feet) to 8 degrees (at 15 feet)
* Focus adjustment: Front group rotating extension system with USM
* Closest focusing distance: 4.9 feet
* Zoom system: Rotating type
* Filter size: 58mm
* Dimensions: 2.8 inches in diameter, 4.8 inches long
* Weight: 16.8 ounces

Technical Details :
- 75-300mm telephoto zoom lens with f/4.5-5.6 maximum aperture for Canon SLR cameras.
- Micro ultra-sonic monitor (USM) makes auto focusing quicker and quieter than before.
- Improved zoom mechanism with silver on the front; 4.9-foot close focus distance.
- Ideal for shooting sports, portraits, and wildlife; lightweight frame weighs 16.8 ounces.
- Measures 2.8 inches in diameter and 4.8 inches long; 1-year warranty.

Pros:
- Cost; you would be hard-pressed to find a lens with the same reach with even half-decent optics.

Cons:
- Slow focus.
- The USM version is still not an internally-focusing model, and thus the end of the lens will still rotate (and can affect filters, etc.).