Two UD glass elements in the first group thoroughly eliminate chromatic aberrations at telephoto focal lengths, realizing the high image quality befitting an L series lens. The rear focusing system focuses on using the small, lightweight 6th lens group, enabling quiet, high-speed autofocus. Moreover, shooting at a minimum focusing distance of approx. 0.6m/2 ft is possible at any focal length from 35mm to 135mm, with a maximum macro magnification of 0.25x obtained at the 135mm position. Operation of the lens is fast and smooth with its linear zoom system design and wide-manual focusing ring. At 35mm At 50mm     At 70mm At 100mm At 135mm At 160mm     At 200mm At 250mm     At 300mm At 350mm Autofocus speed is, as expected, fast and silent. After all, it uses Canon's Ring USM for its AF operation. Full-time (FT-M) manual focusing is possible with this 10x zoom lens as well. This lens is more at home with professional photographers covering motorsports and other outdoor sporting events as the variable maximum aperture of f/3.5 at the 35mm position and down to f/5.6 at the 350mm focal length make it practically impossible to shoot anything under both available and low-light situations. However, the lens' portability and ease-of-use among motorsports photographers have also been undermined recently due to the availability of the EF 100-400mm f/4.5-5.6L IS USM zoom lens where the built-in Image Stabilizer makes up for the lack of a 10x zoom ratio, which the former has. Surprisingly, the EF 35-350mm is still much more compact and slimmer than the EF 100-400L IS USM lens even though both share the same push-pull zooming method and overall appearance. The former also uses a 72mm filter and similar close-up accessories as opposed to the 77mm thread utilized by the latter. In terms of handling in actual practical applications, both zoom lenses demonstrated the same level of superiority that is synonymous with L-series optics. << Back to Main . 1 . 2 . 3 .