Originally Posted by bob williams
I think the 100L would be perfect for you; I love using it on my 5D2. I used to shoot the 70-200 f/4 L IS a lot for macros just because of the I.S. (you can actually get pretty good magnification with a TC and/or extension tubes), but the keeper rate on the 100L is even better (I think). Not to mention sharp as a tack -- even wide open. The focus ring is nice and smooth. If you were going to be indoors and stopped down, you could probably save money with a non-L macro, but if you like to be tripod free when you're outdoors, then go for it. I also love shooting the 135, but I don't think I would use it as much for nature stuff.
The 180 macro is a good consideration too, but I've never used it. It gives you more working distance, which is critical especially for outdoors stuff, but without I.S. you might find that you can't stop down enough, even in sunlight. (For 1:1 at 180mm on a 7D, I'm pretty sure I would need at least 1/500 just to get a 25% keeper rate).
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