For nightscapes the Sigma Art 14 and 28 are good.
The best lenses I have heard of are Voigtlander APO lenses. They are medium expensive - around $1000.
The older Canon 50 1.8 isn't bad and its cheap.
Canon L 24-70 F2.8 is fine.
But really Canon does not have a really good nightscape lens.
Samyang are good if you get a good copy. QC is not their strong point but from what I have read if you stick to their upper models the QC is much better.
I have a Samyang 135 F2 Canon mount and a 21mm F1.8.
The 21mm I had to open up to shift the infinity stop as the lens focus ring did not have enough travel to get to infinity focus. I fixed that but it shows the type of issue you might have.
Greg.
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