Interesting short clip by Canon Imaging Plaza on YouTube about how Canon’s new Blue Spectrum Refractive Optics (BR) technology works. Pretty interesting.
The Blue Spectrum Refractive Optics (BR) lens is a compound lens that uses Blue Spectrum Refractive (BR) optics. BR optics are made from an organic optical material developed by Canon, and have anomalous dispersion properties equal to or greater than fluorite. When combined with concave and convex lenses, they can correct chromatic aberration to a degree greater than previously achievable.