Sigma 100-400mm Lens..

[Alysia]

I was looking at getting a Sigma 100-400mm lens for my canon 450D.
I want to use it for wildlife, but I was told not to buy one, because it lacks quality.

Does anyone own, or has owned this lens that you could give some advice on the lens.

Thanks

[MarkChap]

You are talking about the 120-400 ??

Who told you it lacks quality ? in what way/area ?
A quick search has found these threads, some good and bad in each

http://www.ausphotography.net.au/forum/showthread.php?49214-120-400-or-the-150-500-Sigma&highlight=120-400

http://www.ausphotography.net.au/forum/showthread.php?15310-sigma-150-500mm-os-or-sigma-120-400-os&highlight=120-400

http://www.ausphotography.net.au/forum/showthread.php?49214-120-400-or-the-150-500-Sigma&highlight=120-400

http://www.ausphotography.net.au/forum/showthread.php?35822-Sigma-120-400-OS-is-the-Canon-100-400-killer&highlight=120-400

[Kym]

Which sigma?
http://www.sigmaphoto.com/shop/telephoto-zoom-lenses

The Canon 100-400 L has a very good rep (ask Richard hall).

Sigma 150-500 ?