Cameras

R - Reset View to default (hold for several sec)

2D

Camera (Transform 2d)

Pan - Right drag
Zoom - Mouse wheel

3D

Camera (Transform 3d Softimage)

Orbit - O + Left drag
Distance (Dolly) - P + Left drag
Pan - Z + Left drag
Zoom (FOV) - Z + Right drag

Camera (Transform 3d Orbit)

Orbit - Left drag
Distance (Dolly) - Right drag
Pan - Middle drag
Zoom (FOV) - Ctrl + Mouse Wheel