How to understand the light distribution diagram?

The optical distribution diagram is a common diagram in the field of optical design, which is used to show the optical properties of optical systems. Here is some basic information to interpret the light distribution diagram:

X axis: Usually represents the Field of View (FOV), that is, the Angle from the center of the optical system to the edge of the field of view.

Y-axis: Indicates light Intensity, usually expressed in specific units, such as light intensity or Flux.

Curve: represents the optical performance of the optical system under different field angles, usually in a semicircular or elliptical shape. The shape of the curve can reflect the defocus property of the optical system and the lens design.

Radius: The longest distance from the center point of the graph to the curve, indicating the maximum light intensity of the optical system.

Uniformity: The uniformity of the curve reflects the optical uniformity of the optical system, that is, whether the distribution of light is uniform.

Depending on your requirements, you can evaluate the optical performance of the optical system by looking at the light distribution curve diagram, such as evaluating its maximum light intensity, uniformity, defocus, etc.

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