For most professional stationary 3D scanners it is common practise to use several scanning areas/volumes, also called FOVs — fields of view. Switching between FOVs to scan objects of different sizes allows to get the most out of cameras and projector. Scanners from RangeVision, Breuckmann and other manufacturers have the ability to move the cameras and, therefore, adjust the size of FOV. Other models, like Open Technologies Cronos, have several camera pairs for each FOV. Also, there are scanners like GOM Core, which are produced in different modifications for different fixed FOVs - Core 80, 300, 500 etc.

RangeVision scanners use 3 FOVs.

• L (#1) — approx. 50х35 cm, calibration plate 34х34 cm
• M (#2) — 30х20 cm, plate — 20х20 cm
• S (#3) — 15х10 cm, plate — 8х8 cm
• No longer in use FOV #4 — 7х5 cm, plate 5х5 cm
• No longer in use FOV #0 — 90х60 cm, plate 60х60 cm

Possible FOV sizes of one of the Breuckmann models by width in mm: 75, 100, 200, 400, 600, 1100.The GOM FOVs are listed above.

FOV sizes from different manufacturers are approximately equal, ranging from 6 to 100 cm. This is dictated by technical restrictions, convenience of operation and common sense. Attempts to create scanning volumes of 3 cm in order to get a higher resolution for the smallest objects have been unsuccessful. The same goes for large calibration plates designed to make scanning big objects faster.