Adapter that is sold separately to provide good landscape shots.

It also is great for taking scenic shots as you can include a lot more image in the picture.

A NICE WIDE ANGLE SHOT OF THE GOLDEN GATE BRIDGE WITH IT

If you're looking specifically for a wide-angle lens and can take well-lit shots, consider this

(I did this recently on vacation with the Sigma 30mm attached).As far as the lens is concerned, it takes nice wide shots, which can be good for landscapes and inside

The combo makes for nice shots, the absence of zoom means you fiddle less and spend more time composing the shot

I've got to conclude the not so sharp shots are due to my shaky camera holding and inattentive focusing

I have grabbed some AWESOME shots with the ultra wide-angle lens attached to this baby.