Based on a patent filed by Canon, there are now rumors that the company is working on 600 and 800mm f11 long primes incorporating Diffractive Optics (DO) technology that would help make the lenses even and smaller. If the rumors prove true and Canon does release these lenses, while they would not be as versatile as big-aperture primes such as 600 f4 and 800 f5.6, they have the potential to introduce many more people to wildlife photography.

In this video, Adrian Cho talks about what these lenses might mean for wildlife photographers and for Canon.

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