A patent showing three different optical formulas for APS-C sensor cameras has appeared. According to Canon News, this patent is missing some good information that would help narrow down what these embodiments are for.
The 3 embodiments: 15-45mm f/2. 8-5. 6 15-45mm f/2. 0-5. 0 15-60mm f/2. 0-5. 0 From Canon News: Our assumption with this patent application is that these Read more. . . . canonrumors.com