alan_bryant1

<p>You could rent one. I've rented multiple times from lensrentals.com and found their service very good. The Canon 100-400 and Tamron 200-600 are two lenses you might consider. Be sure to tell them you'll be taking the gear out of the country.</p>

<p>It's possible a firmware hack like Magic Lantern might be able to do it.</p> <p>DSLR sensors aren't really designed for continuous-duty video capture. They tend to overheat.</p>

<p>Depending on how large you're printing these photos, the difference between the 15-85 and 17-50 may or may not matter. If you removed the chromatic aberration from the 15-85 images, which is easy to do, you might not be able to see any difference even in a pretty big print.</p> <p>Remember when you're pixel peeping, you're looking at the equivalent of a gigantic enlargement. Like a 36x54 inch print.</p>

<p>Stefanie, thanks for the samples. A few observations,<br> - The 15-85 clearly has much more chromatic abberation than the 17-50, this is causing the red/blue color fringes visible in those photos. It's remarkable how much better the 17-50 is in this regard.<br> - Your shutter speed was high enough on all of these, camera shake is not likely to be a problem. <br> - The 15-85 does seem a little weak, though it isn't awful. Since foregrounds seem to be better, I'm wondering if it's focusing too close, and if the small apertures you're using are concealing most of the focus error.<br> Most lens problems will be easier to see with the lens wide open, so the small apertures are working against us for detecting problems, particularly focus errors.</p>

<p>You could wait for the recently announced EF-S 10-18mm IS, which is expected to be shipping in June. It's only $300, very reasonably priced.</p> <p>The EF-M 11-22 isn't officially being marketed in the US, though some people might be importing them. But I think they're always "grey market", without a US warranty. Probably not many people in this forum have experience with it, though it's a fine lens as far as I've read.</p>