Nikon’s 24-70mm f/4 lens is a “kit lens” of sorts which accompanies the new Z 7 and Z 6 cameras – or it can be bought separately (though it’s much cheaper to buy it as part of a bundle).

It is one of two lenses which are available to buy for the brand new camera series at the time of writing – the other being a 24mm f/1.8 S lens. A third lens, a 50mm f/1.8 is due to arrive some time before the end of 2018.

The “S” line is the very first line of proprietary lenses for the Z mount, with speculation that there will be other lines available at some point. The S line is designed to be the sharpest and best available, which goes some way to explaining their high asking price.
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https://www.photographyblog.com/reviews/nikon_z_24_70mm_f4_s_review