Image stabilization and tall buildings

[neuroanatomist]

I am not an IS expert, but how I would think it works:

1. For Canon the IS system senses either 2 axis of rotation (pitch-yaw) or the newer IS systems have 3 axis of rotation (pitch-yaw-roll).

Lens-based IS does not and cannot have correction for roll – the lens elements are round, rotating them would not change the image. Only sensor-based IS can correct for roll.

I'll just add a 4.1 to Pat's list. Some lens have "automatic panning detection", so there is multi-mode IS, but it is not user selectable.

Indeed. In fact, when the EF-S 18-55mm f/3.5-5.6 IS was updated to the MkII version (prior to the STM), the lenses were identical except for some cosmetic changes (labeling font, a silver ring made black, mount registration mark painted instead of embossed), and the addition of automatic panning detection to the IS system.