There are a number of keys that provide direct access to zoom functions. They keys can be pressed in most modes. These are:
| + or = or numeric keypad + | Makes the active photograph (or the active 3D Viewer) zoom-in under the current cursor position. 
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| - or _ or numeric keypad - | Makes the active photograph (or the active 3D Viewer) zoom-out under the current cursor position. 
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| F | Makes the active photograph fit completely within the current window. | 
| Shift+F | Does Zoom-to-Fit on all open photographs. 
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| ALT | Brings up the Zoom Window. See next section. 
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| CTRL | Enters the temporary Zoom-Area and Pan mode. See the section after next. |