1. In order to achieve special artistic effects, photographers add color filters in front of the lens. The red color filter added in front of the lens allows what color light to pass through and absor

1. In order to achieve special artistic effects, photographers add color filters in front of the lens. The red color filter added in front of the lens allows what color light to pass through and absorbs.

Let red light pass through and absorb other light

Reference: The red mirror (R) can block the transmission of blue-green light, making the sky, leaves and other bluish objects part becomes darker. Using a red mirror in black and white photography has an excellent effect of highlighting white clouds and darkening the sky, and it can absorb ultraviolet rays. When photographing blue drawings and documents under artificial light, a red mirror can provide good contrast. This lens is also commonly used in infrared photography.