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Canon® EOS Rebel XSi/450D Guide to Digital SLR Photography by David D. Busch

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Lens Components

The typical lens, like the ones shown in Figures 2.13 and 2.14, has seven or eight common features. Not every component appears on every lens. The 18-55mm lens on the left, for example, lacks the distance scale and distance indicator that the 17-85mm lens on the right has. Lenses that lack image stabilization will not have a stabilization switch.

  • Filter thread. Lenses have a thread on the front for attaching filters and other addons. Some also use this thread for attaching a lens hood (you screw on the filter first, and then attach the hood to the screw thread on the front of the filter).

  • Lens hood bayonet. This is used to mount the lens hood for lenses that don’t use screw-mount hoods (the majority).

  • Zoom ring. Turn this ring ...

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