Canon being late to the AF party (last century). They ended up with all electronic contacts when they switched lens mounts for the “eos” series cameras though

Canon being late to the AF party (last century). They ended up with all electronic contacts when they switched lens mounts for the “eos” series cameras though at the expense of not having backward compatable lenses. (I had a bunch of manual focus lenses at the time…) They had one “auto focus” camera for the old lenses the t80. (https://global.canon/en/c-museum/product/film115.html https://global.canon/en/c-museum/product/film115.html) but almost no lenses supported autofocus. I think most of settings the camera sent to the older lenses (aperture primarily) was done mechanically. The way these old cameras autofocused was pretty interesting. With some light passing through a semi transparent mirror onto different sensors. Edit: this site has another page about autofocus. Quite extensive. https://exclusivearchitecture.com/03-technical-articles-DSLR-03-autofocus-systems.html https://exclusivearchitecture.com/03-technical-articles-DSLR... Shorter canon article: https://support.usa.canon.com/kb/s/article/ART170280 https://support.usa.canon.com/kb/s/article/ART170280 I have one of those mirrorless slrs now. The focus is amazingly good. Lots of software (eye detect etc). The focus sensors are integrated into the image sensor I believe.