DEFINING SPACE

The use of an extreme wide-angle lens, like this fisheye, need not generate the bendy look of “barrel distortion”. It’s all in the composition.

By MICHAEL PERKINS

VISIT ENOUGH TOURIST SITES and you will eventually encounter the challenge of capturing very large objects, trying to squeeze the whole of a cathedral or a canyon into a single frame. Using a wide-angle lens is the first instinct, of course, but since even a 35mm is considered a wide-angle of sorts, there are any number of choices that all have their own pluses and minuses.

The lower the millimeter number, of course, the wider the lens. Simple enough on the surface, but you still have to decide what kind of wide you prefer. Each lens has slightly different coverage and properties, with the “super-wides” adding their own distinctive traits to the space you’re trying to capture. The two main properties you’ll notice most are barrel distortion and dimensional exaggeration, both of which will affect your lens choice for a given shooting situation.

Let’s look at barrel distortion. Lenses wider than about 24mm can make straight walls appear to bend outwards like the sides of a barrel, creating an unreal, and, for some, somewhat claustrophobic appearance most associated with the ultimate width of a fisheye (something around 8mm). The effect is that of a world cramped into the inside of a snow globe, and, depending on what look you’re going for, it can either be marvelous or miserable. It’s marvelous, for example, if you want to suggest tremendous depth in a shot.

A more modest wide-angle, like this 24mm delivers more conventional dimensions, but not as much coverage. 

And that’s dimensional exaggeration, the other key trait of a  super-wide, in which the perception of distance from front to back is greatly hyped, making a deep space look even deeper. Shooting a cavernous area like the inside of the rotunda at the Los Angeles Central Library, as seen in the frame at top, you may want to suggest vastness, and a fisheye, such as was used here, does that superbly. All I’ve done to defeat the accompanying barrel distortion is to crop away the original frame edges. Of course, using a more conventional focal length like a 24mm, as seen directly above, shows all dimensions in a much more natural way, but they sacrifice coverage area, revealing less of the ceiling and sides and creating the sensation that the shot is not inclusive of enough information. In the case of both lenses, how you frame and where you stand will produce significant variations on how you render the space.

Photography is about what to fill the frame with, of course, but it also involves some planning as to how technology does that best, based on the tools at hand and what they’re equipped to do.