Types
Studio dollies are large and stable and can feature hydraulics. These are the first choice for studio, backlot and location shoots when using professional cameras. A studio dolly usually needs a specialized operator called a "dolly grip", and many are built for the operator to ride on the dolly with the camera.
Lightweight dolly systems are more simple, affordable and are best used with lighter-weight cameras. Lightweight systems are usually favored by independent filmmakers and students because they are easier to carry and operate. These dollies support only the camera, and the operator needs to move alongside. Some lightweight dollies are small enough to be carried in a backpack.
The best way to be able to replicate the same camera movement for multiple takes (which is important for editing) is to use a dolly on track.
Read more about this topic: Camera Dolly
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