Tumble, track, and dolly the view These camera moves are relative to the "homing direction" you've set for the viewer. To change the homing direction, use the viewer pane's View > Homing Direction sub-menu.
To... Hold and drag
Tumble SpaceLMB
Dolly
  • SpaceMMB
  • Mouse wheel forward/back
Pan (track) SpaceRMB
Zoom SpaceAltMMB
Tilt (dutch) SpaceCtrlLMB
Box zoom (zoom in on a specific part of the view)

SpaceCtrlMMB

Drag the box from left to right to zoom in on the area inside the rectangle. Drag the box from right to left to zoom out (so the current view fits inside the rectangle).

Dollying moves the camera forward and backward. Zoom changes the configuration of the virtual camera lens.