Canon patent application shows variable apodization using electrochromic elements

A Canon patent application in Japan outlines the technology and optical formulas to achieve Defocus Smoothing using electrochromic elements (EC). With EC elements, a lens with variable apodization is possible. Before looking at the patent literature, it's worthwhile to look at Canon's existing Defocus Smoothing technology. In 2019, Canon released the RF 85mm F1.2L USM DS lens. The Defocus Smoothing (DS) technology works to create softer bokeh with smoother outlines. The result is achieved by con...