The size of the dome significantly influences the number of possible seats. It also determines the degree of immersion. Larger diameter domes are more suitable for simulating "infinity" than smaller domes. The larger the dome the higher the costs, of course, and the costs rise exponentially as the dome size increases. Although projection domes can usually be made to measure, standard sizes are recommended. They are usually less expensive and can be delivered more quickly.
Permanently installed projection domes differ according to construction methods and materials:
- Aluminum Domes
- Fiberglass Domes
- Negative Pressure Domes
- Domes Constructed of Plaster
The projection (dome) surface should meet several necessary criteria. Important are accuracy of shape and stability as well as a homogeneous and color-neutral surface. From a dome diameter of about eight meters upwards, the projection surface should be perforated so that no echo is created in the room.