Hello, I need some help on choosing lenses!
I currently wanted a nice wide angle lens for landscape etc.. It will be my first actual wide angle lens, so I went to the photography store, and I am choosing between the Canon 10-22mm, or the Sigma 10-20mm.
What lens produces sharper images, and overall better quality between the two? I quite like the Canon preferably, but the Sigma is a bit cheaper.
Also.. I have been calling around for used lenses, and one store has the Sigma 120-400mm lens. The man who owned it only had it for 6 weeks, so it is in good shape.
How good is this telephoto lens?? it is worth the money (it is $799), and how great is the quality, colour, and sharpness?
Thanks in advance! 

