APS-C vs full-frame lenses

APS-C vs full-frame lenses I have a Sony APS-C body and I’m looking for an 85mm portrait lens. Let’s say I get this lens (Sigma 56mm APS-C), the description says it is equivalent to 84mm full-frame. Does that mean that when I put it on my camera, the “real” focal length that my camera sees will be 84mm or 56mm, since it is designed for APS-C? Now let’s say I get this (Ze...

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