In general, you should select the distance and lens combination that allows you to fill the full frame with the entire asset, including the base. It may also be beneficial to include some background objects such as piping or structures. Specifically, it will depend on several things:

  1. Size of the object you're recording
  2. Distance between the camera and the object

Below are examples using five different focal length lenses on the same camera all positioned 5.5 feet (1.7 m) from the object. As you can see, each lens halves the field of view or doubles the zoom.

6mm lens

12 mm lens