Difference between Spherical and Cylindrical in LR 9.0 Pano Merge

[robcrandall2]

As I toggle between the two, there is a slight change. What exactly is the difference?
BTW, "Fill Edges" is a welcome addition.
(LRClassic 9.0 on Mac)
Thanks.

[Chris Kern]

As I toggle between the two, there is a slight change. What exactly is the difference?

The spherical projection fits the pano onto the inside of a virtual sphere, the cylindrical onto a virtual cylinder.  (The perspective projection fits it onto a flat space.)  Adobe provides some guidance on when to use each, but when you're unsure, just try each and decide for yourself which best suits your image.

[kers]

Because of that : in cylindrical the vertical lines remain straight, only the horizontals curve (campbellsoup tin) : In spherical both curve ( globe)

The small/ big difference depends on the vertical anglesize of you panorama;

[Rendezvous]

Because of that : in cylindrical the vertical lines remain straight, only the horizontals curve (campbellsoup tin) : In spherical both curve ( globe)

The small/ big difference depends on the vertical anglesize of you panorama;

thanks, that's a good way of explaining it.