http://www.nikonchat.com/nikon-d7000-nature/

10-24mm Ultra Wide Angle Zoom?
I know people are going to read my question than ask my photography background so I figured I would give a little bit of my background first than ask my question.
I am currently a student photographer I have been hired to shoot some weddings in the past. I wouldn’t consider myself a amateur I am more of a (advanced to semi-pro) photographer. I have sold several sports prints of my work, and although I do shoot a lot of sports I have been starting to dabble in panoramic nature shots.
My question is I have always done my nature shots with my standard Nikon 18-55mm zoom, but have been thinking of buying the Tamron 10-24 Ultra Wide Angle. So I guess my real question is how much wider of a shot will I get than using the standard 18-55mm.
If anyone is wondering about my mounts I shoot with a Nikon D60, and nikon d7000
Go here:
http://www.europe-nikon.com/en_GB/product/nikkor-lenses/simulator
Nikon D7000: Nature