Canon EF 28-105mm lens
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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.
[edit] 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:
 Lens at 28 mm |
 Lens at 105 mm |
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.
[edit] 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.
[edit] Specifications
| Attribute | f/4.0-5.6 | f/3.5-4.5 |
|---|---|---|
| Image |  |
 |
| Image stabilizer |  No |
|
| Ultrasonic Motor |  Yes |
|
| L-series | No |
|
| Diffractive Optics | No |
|
| Macro | No |
|
| Maximum aperture | f/4.0-5.6 | f/3.5-4.5 |
| Minimum aperture | f/22-32 | f/22-27 |
| Max. magnification | 1:5.2 | |
| Weight | 0.46 lbs. / 210 g | 0.83 lbs. / 372 g |
| Diameter | 2.6" / 6.7 cm | 2.8" / 7.2 cm |
| Length | 2.7" / 6.8 cm | 3" / 7.5 cm |
| Filter diameter | 58 mm | |
| Horizontal viewing angle | 65° - 19° 20' | |
| Diagonal viewing angle | 75° - 23° 30' | |
| Groups/elements | 9/10 | 12/15 |
| # of diaphragm blades | 6 | 7 |
| Closest focusing distance | 1.57' | 1.6' |
| MSRP $ | $140 | $230 |
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