For the long time 35 mm was considered as the fairly wide angle lens when mounted on 24x36 mm (35mm) film format. Then 28 mm became standard for a wide lens, then we got spoiled so 24 mm became a "must have" item in our bags. Now we are normaly using whole range of 14, 20, 24, etc. rectilinear lenses, accompanied by 8 mm circular and 15 mm diagonal fisheyes. When mounted on digital bodies with APS-C size sensors, those lenses behawe somewhat differently. Here are the findings about different wide lenses behaviour on Nikon D70.