The NIKKOR Z 24–70mm f/2.8 S is a pro-grade, constant-aperture standard zoom for the company’s Z-system mirrorless cameras; right now, that’s the Z6 and the more senior Z7.

Nikon may have already introduced a 24-70mm lens in this system – the NIKKOR Z 24-70mm f/4 S – but this new optic brings with it a handful of advantages over that lens.
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https://www.techradar.com/reviews/nikon-nikkor-z-2470mm-f28-s-review