The Canon EOS system of digital single-lens reflex (SLR) bodies and lenses is the standard choice among professional photographers worldwide.
Small sensor bodies are good for telephoto work, such as wildlife photography. A 100mm telephoto lens that would be ideal for portraits on a film or full-frame sensor body gives a 150mm equivalent perspective on a small sensor ("APS-C") body. The full-frame sensor bodies are good for wide angle photography, low-light photography, and ultimate image quality.
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