Wide lens suggestion for APS-C

Jan 24, 2015
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New to the forums; recently got back into photography this year.

I currently use a 70d body. One of my go-to lenses is the 17-55 2.8. Great combo on a APS-C. However, I'm looking for something a little wider on a crop. Mostly to use on landscapes, landmarks, and maybe some astrophotography.

Was looking at the inexpensive 10-18 STM, or maybe the upcoming Tokina AT-X 11-20mm 2.8?

Any suggestions would be appreciated.

Thank you!