Here's a peek inside a modern Canon RF lens.
. While announced simultaneously with the APS-C R100 camera, the RF 28mm is a full-frame lens.
While camera and lens teardowns are not unusual, they are rarely done in cooperation with camera companies, who, as Laing points out, are often secretive and keep their cards close to the chest. As Laing observes, there are difficulties making wide-angle lenses for EOS R mirrorless cameras because of the shorter back focus distance of mirrorless cameras. If Canon tried to take the optical design of a lens like its EF 40mm f/2.8 STM lens and fit it to the EOS R system without adjustments, the lens would be plagued by vignette and poor optical performance.
The distinct wavy shape of the elements enables the RF 28mm f/2.8 STM lens to replicate the shorter incidence angle of the EF 40mm f/2.8 STM lens on EOS R mirrorless cameras. The most prominent aspherical element in the rear of the lens is only possible thanks to the RF mount’s large diameter.
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