Canon has announced a new lens for photography pros and amateurs to try out. The new lens is notable because it is the first L-Series lens to use Canon’s proprietary blue spectrum refractive optics (BR Optics). The special optics are specifically designed to deliver photographers a higher level of chromatic aberration correction for improved image quality.

The new lens is the EF 35mm f/1.4L II USM lens and the BR optics uses a new organic optical material with special anomalous dispersion characteristics designed specifically for use in camera lenses. The design of the optics refracts blue light in the short wavelength spectrum to a greater degree than other optical tech.
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https://www.slashgear.com/canon-ef-35mm-f1-4l-ii-usm-lens-is-first-with-blue-spectrum-refractive-optics-27399531/