Question about Canon EOS Digital Rebel XS / 1000D IS Digital Camera
The maximum aperture is determined by the lens. At 55mm, the 18-55mm lens will not open up beyond f/5.6. This has nothing to do with the ISO or the camera's exposure mode. If you zoom out to 18mm, you can open up to f/3.5.
The varying of the aperture with the focal length is part of the design. While it is possible to build a lens with the same maximum aperture throughout its entire zoom range, that would result in a larger and more expensive lens. For example, Canon has a 17-40mm f/4 lens. That lens weight two-and-a-half times as much and costs more than four times as much as the 18-55mm.
Posted on Mar 23, 2011
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Posted on Jan 02, 2017
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