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Wide angle:
Nikon 14-24 is probably largely still the king.
Sigma Art lenses - plenty of good shots shown here using the 35 Art.
Samyang 14 2.8 is a common choice and plenty of good examples on this site.
Pentax 67 lenses are cheap and with an adapter the 75 4.5, 165 2.8 and 300 4 are excellent. The Pentax 67 300 F4 EDIF lens is around $1000 and is hard to find but see Marco's excellent astrophotos using this lens. Its like a mini FSQ.
Nikon 50 1.8G is good, very sharp.
For Sony Zeiss Loxia 21, Zeiss Batis 18 and Zeiss Batis 25 are great for widefield. The Sony FE 55 1.8 is superb for a narrower view.
Generally speaking fast lenses are a waste for astro as no lens I have seen works ok below F2 without a lot of chromatic aberration and coma.
So don't be lured by fast lenses, they cost more and you have to stop them down anyway.
F4 is starting to get a bit slow for 30 second images but for 90 second exposures they should be fine. Canon 70-200 F4L may have too much CA wide open. Not 100% sure about that. The F2.8 model may be better there or the later F4L IS version.
But to be honest I haven't really seen too many great Canon lens nightscapes. Usually they use Samyang 14 2.8 or Sigma Art 35 or sometimes a Tokina (a bit more aberration though). Also generally speaking zooms are not your best choice, primes are.
Some Pentax Super Takumar 200 or 150 are good as well, Marc has done a lot with those and they look great.
Nikon 180 2.8 ED is good with an adapter for Canon.
Greg.
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