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The zoom lens is great for day time work and I have used the Tamron 18-200 for some DSO work. See image below.
What is best for astro work is a Prime lens.
The most popular for the budget conscious is the Canon Nifty Fifty F1.8. It has it's faults, coma being a big one, but you can work around that in Photoshop or just by framing the image around it. But at around $130, you won't find a better, cheaper lens.
My next favourite is the Tamron 90mm Macro. It gives stunning images both in daytime Macros as well as wide field Astro work. You can pick them up 2nd hand, if you're lucky, for around $350.
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