How Aspherical Lenses Fix Aberrations and Improve Sharpness
What is an aspherical lens and what does it do? Canon has shared a video that explains the problems engineers face in lens design and how the company solved them using aspherical lenses.
Hulking Attachment Gave Canon FD Lens Autofocus 40 Years Ago
The Canon Zoom Lens FD 35-70mm f/4 AF was a lens originally manufactured in 1981 and features an unusual motor system that allowed it to autofocus. In Kai Wong's 13-minute video, he shows how it still works remarkably well even today.