17-35 or 16-35?

2.8 is useful if you are shooting moving subjects in low light but if you are using a tripod and shooting basically static objects(stars) the 4.0 should be fine. I shoot startrails all the time with my Tokina 10-17m f3.5-4.5 and I just use a little longer shutter speed than when shooting at 2.8. I do love my set of 28mm 50mm and 85mm 1.8 primes though but mostly for their boque when shot @ 1.8-2.2
 
I dunno. The f/2.8 is pretty important for stars. Anything longer than 30 seconds typically means blurred stars. So the more light you can get in 30 seconds at a lower ISO is way better.
 
4.0, 30 sec @ ISO 1600 is what I usually shoot at. I've never had to shoot over a 30 sec exposure with my Tokina. If it were me I'd get the 17-40 and the sigma 20mm 1.8 instead of the 16-35.

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Oh yeah.
I ended up getting a 5d, 24-105 f4, and a sigma 20 f1.8

You will love the images from the 5D and the low light performance. It is a !@#$% to lug around though which is why I usually end up taking my T2i on backpacking trips. I'll take the 5D if it's an easy day hike or something. The T2i feels like a toy after holding the 5D...:lol:
 
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