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In most cases, you must solve survey shots as a Zooming lens. This is a consequence of the different image sizes, lenses, etc. SynthEyes configures survey shots as Zooms automatically.
If all images are exactly the same size, and were shot on the same physical camera with the same prime lens, or you are 100% positive that the zoom lens was never zoomed because you shot it, only then can you solve the shot as a Fixed, Unknown lens.
Survey shots are processed slightly differently during solving, because the images are largely unordered.
If the solver cannot locate initial seed frames, you can set them manually on the Solver panel. In this case, or if the solver is using an incorrect solution, you can also set the direction hint as well (second drop-down on the solve panel). In any case, you are looking for two frames with many trackers in common, that look at the same trackers from about 30 degrees apart. The direction hint is then the direction of motion from the first camera position to the second.
The solver decides what additional frames to solve, once it gets started, without regard to their order.
You may need to think a bit more about your trackers if the solver does not solve all the frames: that means that you do not have sufficient overlap between any solved trackers and the trackers on unsolved frames. Whereas normally the tracker count
channel in the Graph Editor helps to identify trouble spots, the unordered nature of surveys makes that information uninformative.
In that situation, you may find it helpful to use Script/Select by Type to select all the solved trackers (or select solved trackers in Synthia), examine the bar graph in the graph editor, and see if you can locate the solved trackers on some of the unsolved frames as well.
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