Sigma makes some pretty standard lenses, but they also create some more unique and less heard-of designs that can be the sort of creative shot in the arm that excites a lot of photographers. The 65mm f/2 DG DN Contemporary, which sits in a strange middle ground between 50mm and 85mm, is one such lens, and this great video review takes a look at the sort of image quality and performance you can expect from it in practice.