Well, just looking at it, it's hard to say, as Angelo said... but applying a little logic...
Since it's not a specialty shot requiring a very specific arc, at some point someone probably yelled to grab curved dolly track off the truck. Chances are pretty good it was Matthews track since that's what you usually see on a big-budget "real" feature shoot. Their curved track comes in arcs that make circles with outside diameters of 10', 20', and something really big like 70' or so, if memory serves.
We can guess that that was the middle size. The arc is not nearly tight enough to be the 10' track, so it's probably the 20'. With the radius of 10' in that setup, accounting for the 24.5" width of the dolly, that would put the camera center (assuming it was centered on the dolly) at about 9' from the talent. The film plane would be about 8' from the subject. If that's the case, based on the framing of that shot I'd say you're looking at a 80mm lens.
So... my guess is 80mm at 8 feet from the subject.
Of course, that's a wild guess... the dolly move is so slow we can't tell if there was any panning that could actually vary the subject distance, and the focal length.
T2
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Todd Terry
Creative Director
Fantastic Plastic Entertainment, Inc.
fantasticplastic.com