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| p.1 #7 · Pros/cons for wide angle choices with my shooting style... |
Not to complicate your decision more, but if you don't mind using a prime, you might also consider the Canon 24/1.4 for your starscapes. It's has a two stop light advantage over the best zoom, and though it's a little soft at 1.4, it's definitely sharp by 1.8-2.0. That's a lot of extra light to be gained for long exposures without star trails. Given that a lot of people are selling their 24s for cheap in the B&S area, you can get it for less than a 16-35, and maybe you could still keep your 11-16, too. It also takes the same 77mm filter as your Tokina.
However, zooms have their place, and maybe you'd prefer general focal versatility over extra light. My two cents.