Originally Posted by andnowimbroke
Yes, it will. I keep a UV filter on it (B+W MRC UV, like all my lenses). I've had wind-spray hit me and the camera with the 17-55mm on it, no ill effects. I haven't ever taken the 7D + EF-S 17-55mm out in the rain, though. In fact, I just bought anEF 24-105mm f/4<span style="color: red;"]LIS USM specifically to use as a 'walkaround' lens outdoors and on rainy days. Not trying to talk you out of it, but if you absolutely require weather-sealing, the EF 17-40mm f/4L is just as wide, weather sealed, and for landscapes you probably won't ever need f/2.8 or IS. But IMO, the EF-S 17-55mm is a far more useful lens.
A 5D MkII will easily best the 7D in low light/high ISO performance. But the 7D will be as good or better than the original 5D in that department.
Because cropping is cropping. An EF-S lens has the stated focal length, it just projects a smaller image circle, in alignment with the cropped FOV of the 1.6x sensor. Imagine how confusing it would be if they did alter the focal lengths printed on EF-S lenses to account for the crop - instead of universally applying a factor, you'd have to take lens type into account, so some would need the calculation, others would not. Plus, it applies to aperture (in terms of DoF) as well. Canon recently released the EF-S 15-85mm f/3.5-5.6 lens. Would you pay $700 for a lens marketed as a 24-136mm f/5.6-9IS lens?!? Even if they only 'corrected' the focal length, as 'Joe consumer' would you pay $700 fora 24-136mmf/3.5-5.6IS lens or buy thecheaper 28-135mm f/3.5-5.6 IS lens, apparently giving up only 5mm in total zoom range and saving yourself $300 in the process? Complete confusion would result!
Send me a PM and I'll give you the address. [6]
Seriously, enjoy your new lens!
--John
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