The default camera is the Instant Terra camera, but you can select one of the three different key and mouse combinations - Default, Maya-style, and 3ds Max-style - cameras to pan in the 3D View (see the Camera menu for more details on how to toggle between the different cameras).
To pan in the 3D View:
The camera speed depends on the are of the terrain under the mouse cursor. If this point is far from the camera, the movement is faster than if this point is near to the camera. If you click in an area outside the terrain, the movement is at a default speed.
If you click in an area outside the terrain, the camera rotates around itself.
To zoom in the 3D View:
If the terrain is no longer visible in the 3D View, or if it is off-center, either:
|3ds Max-style camera|
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