Camera

Key	Viewer 2.8	Viewer 1.23
Alt+W or Alt+↑	Zoom in
Alt+S or Alt+↓	Zoom out
Alt+A or Alt+← or Ctrl+Alt+←	Orbit clockwise
Alt+D or Alt+→ or Ctrl+Alt+→	Orbit anticlockwise
Alt+E or Alt+PgUp or Ctrl+Alt+↑	Orbit forward
Alt+C or Alt+PgDown or Ctrl+Alt+↓	Orbit back
Ctrl+Alt+Shift ⇧+W or Ctrl+Alt+Shift ⇧+↑	Pan up
Ctrl+Alt+Shift ⇧+S or Ctrl+Alt+Shift ⇧+↓	Pan down
Ctrl+Alt+Shift ⇧+A or Ctrl+Alt+Shift ⇧+←	Pan left
Ctrl+Alt+Shift ⇧+D or Ctrl+Alt+Shift ⇧+→	Pan right