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I've noticed that large format cameras seem to keep verticals vertical whereas me shooting with 35mm lenses I get much more convergence. Is this just because the photographers are using architectural lenses which can correct for this or something intrinsic to large format?

Large format example - http://www.ourworldmyeye.com/wp-content/uploaads/john_davies.jpg

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You are looking for the Scheimpflung principle. –  MichaelT Aug 20 at 6:24
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@MichaelT - No, the Scheimpflug thing is about tilt (and swing); it simply states that the lens plane, the film (or sensor) plane and the plane of sharp focus in an image (when extended to infinity) will meet at a line. (The "everything is parallel" situation is a degenerate case.) This is about shift (or rise/fall, more correctly). –  user28116 Aug 20 at 7:48
    
Just wanted to suggest that you can fix converging verticals in a digital image using a variety of editing applications that have a "perspective" tool. If the camera is tilted up when the photo is taken you "widen" the top of the image until the verticals are parallel. You will also need to "stretch" the image upward, I usually judge it by eye but there are ways you could do it subjectively. I have a TS lens for my SLR but I like the results from a good lens and manipulating the photo later better. YMMV. –  fCSjxMDv76 Aug 20 at 12:39

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up vote 7 down vote accepted

Its not quite restricted to large format, but is most common there. Whats going on is that on a large format camera, the front "standard" which holds the lens can move independently of the rear standard, where the film is. What a photographer does to avoid converging verticals is not to tilt the camera upwards, but to shift the front standard so that everything he wants in the picture is included.

There are a number of tilt/shift lenses for SLRs that can do the same shifting of the lens.

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With a monorail camera, it's more likely that the photographer would choose rear fall rather than front rise (with a field camera, there isn't that choice, usually). That's because the lens position determines the point of view, so it's the "less adjustable" of the two and is usually set first. That's also why a tripod collar (if available/practical) is a good idea for a T/S lens; you can determine what's peaking out from behind what and by how much first, then worry about perspective and focal plane corrections later. –  user28116 Aug 20 at 7:55

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