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David Busch’s Canon® EOS M Guide to Digital Photography by Lee Sheldon

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Using Telephoto and Tele-Zoom Lenses

Telephoto lenses also can have a dramatic effect on your photography, and Canon is especially strong in the long lens arena, with lots of choices in many focal lengths and zoom ranges. You should be able to find an affordable telephoto or tele-zoom to enhance your photography in several different ways. Here are the most important things you need to know. In the next section, I’ll concentrate on telephoto considerations that can be problematic—and how to avoid those problems.

Image Selective focus. Long lenses have reduced depth-of-field within the frame, allowing you to use selective focus to isolate your subject. ...

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