Understanding camera sensors: APS-C vs full frame – which one do you actually need?

An APS-C camera body or a full-frame camera body? We break down sensor sizes, crop factors, and which camera suits you best.
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Full-frame sensors vs APS-C: what are the differences?

For most of the past twenty years the common digital camera sensor sizes were 1/2.3-inch, one-inch, APS-C and full-frame, with a further alternative in Four Thirds favoured only by Olympus and ...