Great. Thanks a lot.

It would be nice to have a better horizontal adjustment tool. I have made several panos that need to be straightened horizontally and haven't managed to get the 'vertical' tool to do what I want. It is very good for vertical alignments but very tricky to get horizontal alignmets.

- Setting horizon to be horizontal is not that easy, even when using the 'set vertical' button, perhaps another method would be better, e.g. A user can select a few points (perhaps 3 or 4) that need to be 'straightened' to produce a horizontal line, and then press enter.

Using the using the Auto Level button is the first thing to do.

Then, you should place vertical lines using the Set verticals button and using the red (vertical) line or the yellow (horizontal) line to guess the correct orientation.

For some difficult panoramas this is not  enough: the large gray horizontal line which corresponds to the "mathematical horizon" and should cross any point in the subject which was at the same height where the camera lens was, is too low or to high. To correct that you must use a third tool, the Set Center Point button to move this line upward or downward until everything is (or looks) perfect.

An interesting example (very difficult if you are picky enough) is the Greek temple in the Official samples pack where the paved road probably is rising toward the right and the temple probably built like Greek temples were (the bottom part is larger than the top part so that the result is more stable ...and looks higher than it actually is.)

When stitching this pano I used the Set verticals button to place red/yellow crosses on both ends of the road and on the temples but this was not enough. Slightly rising the gray horizontal line seems to give a better result.