This is one area where you usually can leave the telephoto lens in the camera bag. To show the space and scope of an interior, whether it's a small room in a house or a grand ballroom, wide-angle lenses are the tools of choice. Two problems usually confront the photographer trying to photograph an interior: confined space (you can't back up far enough), and limited available light. The answer to the first is a wider focal length -- even the 28mm wide-angle setting on the standard zoom lenses is often not enough to get an entire room into the picture.
Canon has a multitude of options for the photographer trying to capture this type of image. Wide-angle zoom lenses, such as the EF 16-35mm f/2.8L USM, EF 20-35mm f/3.5-4.5 USM give you the versatility of a lens that can handle almost any wide-angle task in one package. They're compact and easy to carry in addition to your standard lens.
Fixed focal-length lenses have a couple of advantages for the photographer who is serious about getting the best results shooting interiors. They typically have faster apertures -- f/2.8 or faster -- which gives a nice bright image indoors, and is a benefit if you can't bring a tripod along and have to handhold the camera. And they give the best correction of linear distortion, keeping straight lines straight. The ultra-wide EF 20mm f/2.8 USM may be the best choice here, and is a great addition for photographers who already own a zoom like a 28-105mm or even the 28-135mm IS lens. Perhaps the ultimate ultra-wide lens in all of SLR photography is Canon's EF 14mm f/2.8L, a fantastic non-fisheye lens that produces fully corrected images that have to be seen to be believed.

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