Zone-System-Grandpa wrote:
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Assuming both cameras have the full size sensor or the same size sensor, the 70-200 f2.8 made by both Canon and Nikon are best choices due to them having zoom capabilities. If fixed lenses are the shooters priority, I'd suggest staying with focal lengths around 85mm up to 135mm..
The OP states the camera is a 7D, which is APS-C.