In this patent application (2024-149828) we have Canon doing some great things with Diffractive Optics (DO). This application shows a super telephoto with built-in extenders and also with diffractive optics. I'm not sure how much these would cost, but they wouldn't be cheap. Just tell the wife it was on sale ;) Canon's objective (no [...] Source...
Published By: Canonrumors - Wednesday, 23 October