Obiettivo Sigma 20 mm f/1.8 EX DG Asph. RF Nikon

One of the best situations in which to consider a third party lens is when the camera body manufacturer does not have an equivalent offering. Meet the Sigma 20mm f/1.8 EX DG Lens - as of this writing, Canon does not offer a lens this wide with an...

I already own and use a heck of a lot Nikon\'s pro 17-35mm D lens, which is only 1.5 stops slower and whose quality is not even bettered by Nikon\'s own 20mm f2.8 D. So, why should I bother with this Sigma? Firstly, the 17-35mm has already been...

I use this lens a lot at parties and group photos, the image is bright and clear with no distortion under normal circumstances. The fast max. aperture is great (about the fastest 20mm lens I know) I havent noticed any abberations in the images,...