Traditional Culture Encyclopedia - Photography and portraiture - What lens is in front of the Canon 50-200 lens?

What lens is in front of the Canon 50-200 lens?

Fluorite lenses. The front of the Canon 50-200 lens is a fluorite lens. The fluorite lens of the Canon 50-200 lens has a beautiful green coating. The rear opening of the telephoto lens is a rectangular window. Usually the fluorite lens can greatly reduce the dispersion of the camera and can make The imaging effect of the camera has almost no chromatic aberration effect.