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In tripod mode, you can use any of the lens modes, even zooming.
However, there must be sufficient information in the shot to make it possible to reliably determine the field of view. The camera must pan or tilt the majority of the camera field of view, across the duration of the shot, with several well-distributed (not bunched) trackers surviving that motion.
In the absence of sufficient information, an arbitrary field of view will result, typically with a relatively high error.
IMPORTANT . On shots with marginal motion, set Tripod Fuzz to zero on the Advanced Solver Settings (there's a preference if most of your shots are like this). This will give you the best chance of determining a valid field of view.
Instead, you should use Known lens mode, using your best available estimate of the lens field of view as determined from other shots from the project. The error can be lower taking any reasonable field of view that you get asking SynthEyes to compute it, when there's no information on which to compute it.
Note that Zoom shots can have a trickier version of this problem: there can be a pronounced zoom sequence that has a clear relative zoom shift, but lacks the overall pan to determine any absolute value. In this case you can set up a field of view constraint (using the Solver Locking panel) to your best guess of the field of view during that portion of the shot, typically the portion when the zoom is wide. Then you'll get the matching computed zoom for the rest.
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