The diffuse reflection of the lens edge can be greatly reduced by more than 80% compared with the raw edge lens after the extinction paint is added to the periphery of the lens.

In Canon, Nikon and other lenses or high-end lenses, the main mirror of the telescope has been dimmed.

Comparison map

Add extinction ink, you can see a layer of slow reflection, and relatively light.

Without adding extinction ink, you can see 5 layers of slow reflection reflection reflection.