Canon EF 28-105mm lens

The Canon EF 28-105 mm f/4-5.6 is an inexpensive zoom lens often included as a kit lens with Canon 35 mm single-lens reflex cameras. 28-105 mm is a standard wide to telephoto zoom range. The Canon EF 28-105 mm f/3.5-4.5 USM is a higher quality zoom lens with a better build quality.

EF 28-105mm f/3.5-4.5 USM

This lens is a well-regarded consumer-grade lens. Its focus motor is ring USM, resulting in quick and quiet autofocus operation; this motor also allows the lens to offer full-time manual focusing. The lens uses internal focusing so the inner lens barrel does not rotate when focusing. This lens uses a "duo cam" type zoom barrel, this allows a more compact design, but still does not rotate while zooming.

This duo cam type zoom barrel is illustrated with the following two pictures:

There are three versions of this lens. The original lens has a five-blade diaphragm. Partway through its production run, this was replaced with a seven-blade diaphragm; however, contrary to normal Canon practice, the name of the lens was not changed. The third version, the EF 28-105mm f/3.5-4.5 USM II, is a cosmetic change. Apart from the diaphragm, all three versions have identical optics and mechanics.

EF 28-105mm f/4-5.6 USM

This is an inexpensive version of the 28-105mm, cosmetically similar to the EF-S 18-55mm or the 90-300mm lenses which have the characteristic rubber grip on the barrel. While retailing for around $100 less, this make has a decreased f-stop range, cheaper build quality (with a chrome-plated ring), and uses a micro-USM instead of ring USM.

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