Lens Sigma 10-20/4-5.6 EX DC HSM
used from 01/2006
My favourite lens. Thanks to my job I am using it almost every day (and unfortunately you can see it on the lens body). I really love wideangle view!
At the beginning I was considering Sigma 10-20 and Sigma 12-24, but those two milimeters on wide angle are really a difference and also you can use filters with Sigma 10-20, which is useful thing in landscape photography.
I am often asked abou this lens, whether it's worth to buy it and I alway say YES. I didn't have the chance to compare that lens to the other simliar products from Nikon, tamron and Tokina, but with Nikkor there is price as a huge minus and in the past when I was buying the wideangle one I wasn't even considering Tokina or Tamron.
There are some minor weaknesses with the Sigma 10-20 such as lower quality on wide angle when shooting against the light, but speaking about the price/performance it's defeinitely "to buy product".
Official product presentation: Sigmaphoto.com
Lens review: Photozone.de