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Hi Andrew, firstly a couple of questions.
What sort of FOV are you looking for, how much sky do you want to image, wide field or deeper DSO.
Also what sort of budget are you looking at ?
Generally prime lenses perform better but you're limited to that FOV and they usually cost more.
Zooms generally suffer from a bit more chromatic aberration but give you the flexibility of variable FOV.
I love the Canon 10-22mm EF-S for wide fields.
The Canon 135mm f/2 and 200mm f/2.8 are very sharp/excellent lenses.
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