Canon EF-S 18-55mm f/3.5-5.6 II Lens (White Box) NEW!!!! Reviews
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Canon EF-S 18-55mm f/3.5-5.6 II Lens (White Box) NEW!!!! Feature
- 11 elements in 9 groups (1 aspheric element)
- Inner focusing system with MM
- 18-55mm 1:3.5-5.6,
(Brand New Lens in White box, Lens was seperated from Rebel XS Kit)
The EF-S 18-55/3.5-5.6 is an unusual Canon EOS lens. It was designed only to be mountable on the Digital Rebel (EOS 300D) body since it has a reduced image circle (enough for the Digital Rebel sensor, but not enough for full frame 35mm) and it sticks further into the camera body than a normal EF series lens. The "S" in EF-S stands for "Short back focus". Back focus is the distance from the rearmost point of the last optical surface of the lens to the film or sensor. There are certain advantages in lens design in having this distance small for wide-angle lenses, but the limit in SLR cameras is determined by the requirement that the SLR mirror must not hit the lens when it flips up. The mirror on the Digital Rebel is smaller than that of full frame 35mm cameras because the sensor is smaller and the mirror only needs to be large enough to cover the area of the sensor. This allows the use of a lens with a shorter back focus distance.The 18-55/3.5-5.6 is a very good lens. It's weaknesses show up at the ends of its zoom range (18mm and 55mm), especially in the corners of the frame when used wide open where resolution and contrast can be rather poor. To get decent sharpness in the corners requires stopping to f8 at 18mm or f11 at 55mm - but you still won't get the same image quality as you would from a a prime or "L" series zoom lens. In the mid range (28mm), performance is pretty good at both center and edge. For a cheap, plastic mount, low end consumer lens, the 18-55 is certainly better than I would have expected. It's not a rival for an "L" series lens, but much of the time it can hold it's own against Canon's full frame coverage mid-range consumer lenses, especially in the center of the frame.
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Apr 29, 2011 06:13:03
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