Technical Details for Manfrotto 521PRO

Manfrotto 521PRO ... power, recording, zoom and focus. Like the 523PRO, the 521PRO features manual focus buttons and an auto focus button, allowing you to achieve in-focus images easily when working in manual focus mode.

The 521PRO also has a progressive zoom speed (the further you rotate the zoom wheel, the faster the zoom), a fixed zoom speed (irrespective of the rotation applied to the wheel, zoom speed remains constant), or a customizable maximum speed, which you can set to exactly the level you want. To set a "custom" zoom speed, simply hold the zoom speed button until the LED flashes and use the wheel to record your speed. The LED shows you which speed you have selected.

The 521PRO can be used for a wide variety of applications. It can be mounted to a huge range of supports, such as pipes, bars, tubes, and flat surfaces.