Proof is commonly defined as “evidence sufficient to establish a thing as true, or to produce belief in its truth.” And that’s the name of this interesting exhibition at the Catherine Edelman Gallery in Chicago. Proof sheets are often the first prints a photographer makes in order to view a roll of film. From these contact sheets, they select the frame from which a print is made. The contact sheet is akin to a diary — few artists ever let the public see these, as it reveals their process and way of thinking.

PROOF brings together 26 photographers who exhibit contact sheets alongside the chosen photograph.