The aperture and focal length on the camera are set according to need.
The procedure was applied to the 3 m focal length off-axis parabola.
The focal length of the evolved system is 0.992298 and the sum of the distances is 0.09881 ($1/10).
Therefore, the focal length becomes the key condition of the threshold producing the plasma in the condition of identical incident energies.
The principle of choosing a focal length is to reduce the effects of the closure as weak as possible.
The pixel pitch and the focal length of the cameras are 0.0185 and 2.5 mm, respectively.
The focal length is longer for a low-intensity front.
It may be necessary to set a larger focal length because of obstructions in the robot's path.
