Translating an interior space into a two dimensional rendering presents the photographer with unique challenges… furnishings arrangement, lighting and not least among them, keeping the vertical walls parallel. Historically the latter was controlled by shooting the scene with a view camera. The back was positioned parallel with the vertical plane of the walls. Then the lens was shifted up to fill the frame. Simple. Sort of. Modern tilt-shift lenses mimic the moves of a view camera allowing the verticals to remain straight from top to bottom. Rooms whose walls are falling away isn’t attractive. Funhouse maybe. Compelling? No way.
If you don’t happen to have a super wide tilt/shift lens, there’s an easy workaround. It involved using Sigma’s 12-24mm f/4.5-5.6 DG HSM ultra wide angle zoom lens on a full frame camera. At 12mm, the lens has a 121º angle of view. It’s also really rectilinear.
By the way, if you shoot a cropped sensor camera, Sigma’s amazing 8-16mm ultra wide delivers a 121º angle of view. It’s rectilinear too!