We'd recommend something like a 24-70mm f/2.8 lens if you’re getting started because it gives flexibility in composition with the zoom focal length range but it also offers a generous wide aperture to maximize light input.
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More light through the lens means we can keep other settings such as exposure length and ISO sensitivity to a minimum to enhance the quality of our image. That's why it's a good idea to choose a lens with a wide maximum aperture, something like f/2.8 or wider will do. In astrophotography we're constantly capturing dim, distant stars that are millions of light years away, so we need to reduce obstructions of that light as it passes through the lens and onto the image sensor. However, if you want to get into deep-field astro without buying one of the best telescopes around (which tend to be expensive) then a telephoto lens might be what you’re after. The ideal lens for astrophotography is one that suits your individual needs, so if you prefer to shoot night skies with landscape views a wide-angle lens might be your best option to fit everything in one shot. However, older models such as the Nikon D750, and the D810A (another astro specialist camera) are also good for those on a budget. Some good recent examples of cameras ideal for astrophotography are: the Canon EOS Ra (an astro specialist), Sony A7 III or Nikon Z6 (both have incredible high ISO performance), and the FujiFilm X-T4 (good all-rounder).
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