I love my 17-55 2.8 crop frame lens. It's the perfect focal length for crop frame cameras like my T4i and your T1i. I've used the 24-105 on a crop frame camera because my work has one, and it's a little slow, and a little long, though it's perfect on a full frame.
Whiskey
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This video shows 15 months of coral growth in my tank in a 30 second timelapse:
https://youtu.be/bF6C57aTDEo
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