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Patent: Canon patents RF 200mm f/2L IS, RF 300mm f/2.8L IS and RF 500mm f/4L IS optical formulation | Canon Rumors

Sadly no, because the RF 500mm f4 in this patent is 2,8 cm longer than the current EF 500mm f4. The DO lenses are lighter and much shorter.

Agree that it won’t be DO. However, the length of this lens patent (if it becomes a real lens) will be closer to the EF version than you suggest. The EF 500mm f/4L IS II is 383mm, that’s the spec of the actual lens. The 411mm length above is the length of the optical formula, which is true for all lens patents. To estimate the length of the real lens based on a patent, you need to subtract the flange focal distance, which is 20mm for RF. Thus, the RF lens described here would be ~391mm long, only 8mm longer than the EF version.

We will be happy to hear your thoughts

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