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All the previous makes sense.
I note you are using a 7D (APSC sensor).
I use a 17-55mm f2.8 unguided for reasonable and relatively flat wide field astro, but the results have no comparison to a guided prime lens.
For APSC cameras and terrestrial photography the 17-55 makes a dam fine compromise lens for daily use. Note some users have had dust problems, I have not. It gets great reviews from professionals.
My 17-55 was bought 3months old with warranty for AUD850. So keep your eye out for people upgrading from ASPSC to full frame as this lens is APSC only.
Cheers,
David
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