For those who hear about the fact that Canon used to have 35mm SLRs with eye-controlled AF, but have never had the opportunity to try it themselves, it’s an intriguing proposition. Look at something, and the camera just focuses on it. Sounds great, right? Well, for those that have actually used it, the response is very mixed. My dad had it on his EOS 5. He loved it. I tried it and I hated it.
The theory’s great, but the implementation wasn’t. Canon seemed to abandon the idea, but now a new patent suggests that they might be looking to reintroduce the concept into future EOS R mirrorless cameras at some point.