| Canon EF 28-135mm f/3.5-5.6 IS USM Specifications | |
| Frame Coverage | 35mm |
| Lens Construction (groups) | 12 |
| Lens Construction (elements) | 16 |
| No. of Diaphragm Blades | 6 |
| Minimum Aperture | 22-36 |
| Closest Focusing Distance | 0.5m (19.7") |
| Maximum Magnifcation | 0.19x |
| Filter Diameter | 72mm |
| Maximum Diameter x Length | 78mm x 97mm (3.1" x 3.8") |
| Weight | 549g (19.4oz) |
Reviews
Source
Ali Ozer
Although the Canon has an edge over the Sigma with the slightly better photo quality and its wonderful image stabilization, Sigma is a decent enough lens with a hard-to-resist size and a reasonable price.
William Castleman
It is unrealistic to expect great optical performance out of a variable aperture consumer zoom lens designed as a compromise. Less than excellent resolution at wide open apertures, substantial linear distortion, and contrast drop off at long focal lengths are to be expected. Nevertheless, there are times when you can only take one lens, and each of the consumer lenses tested has its good points.
PhotoZone.de
Similar to the Canon EF 28-105mm f/3.5-4.5 USM the EF 28-135mm f/3.5-5.6 proved to be a solid performer without any spectacular strengths nor weaknesses except a positive peak at its 28mm setting.
William Castleman
The two expensive L-zoom lenses predictably outperformed the consumer quality EF 28-135mm lens on many tests. However, the differences in image quality that end up being visible in a print are surprisingly small.
Luminous-Landscape.com
For the past year I have been using the 28-135 IS USM because it is relatively inexpensive, portable, has good zoom range and is an eminently decent quality lens. Along came the 24-105 offering portability (only a wee bit heavier than the 28-135), good zoom range and top quality at three times the price.
