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

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But Don’t Forget the Crop Factor

From time to time you’ve heard the term crop factor, and you’ve probably also heard the term lens multiplier factor. Both are misleading and inaccurate terms used to describe the same phenomenon: the fact that cameras like the Rebel XSi (and most other affordable digital SLRs) provide a field of view that’s smaller and narrower than that produced by certain other (usually much more expensive) cameras, when fitted with exactly the same lens.

Figure 6.1 quite clearly shows the phenomenon at work. The outer rectangle, marked 1X, shows the field of view you might expect with a 28mm lens mounted on a Canon 1Ds Mark III camera, a so-called “full-frame” model. The rectangle marked 1.3X shows the effective field of view ...

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