Just stumbled on this thread and it makes for very interesting reading.
Like the original poster I'm currently using a Canon 55-250mm lens (on a Canon EOS500D body) and, although I'm mighty pleased with some shots I've taken, I really feel like I'm a bit lacking in range at certain tracks so I I want an upgrade.
The Canon 100 - 400 certainly seems to be the "dream" lens (and there are some cracking pictures taken with it!), but I just can't justify that sort of money for a lens at the moment.
Are there any Sigma users in here? Do they give a decent performance for lesser money, or is it just a falso economy and I'm better off saving for the Canon?
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