Get the best glass you can afford, and you won't regret it. Is it worth it? Canon wouldn't make the stuff if photographers didn't think it was worth it.
Every railfan who uses Canon needs to have some flavor of the 70-200 L - it's perfect for train photography. I have the f/4 non IS, which pops up used on KEH once in a while for $450 or so. I'd love to have the IS version sometime - until then I'll use a monopod or tripod.
If you don't already have decent short glass, you could look at going non-IS with a used 70-200 L and pickup the 17-40 L, which I've heard all kinds of good things about.
_________________ Nick Benson | | |
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