View angle = field of view (FOV) of the camera.

• Given the same flight height, view angle is determined by focal length.
• Smaller focal length → larger view angle (wide-angle lens).

• Larger focal length → smaller view angle (telephoto).

• Diagram relationships: f₁ > f₂ > f₃ ⟺ α₁ < α₂ < α₃.