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Canon Patent Application: Diffractive Optics 500 and 600mm Super Telephotos
Canon continues to pour money and resources into the development of diffractive optics super telephotos. We have seen a prototype of a 600mm for over a year now, and here's another patent application that describes 500mm and 600mm diffractive optics super telephotos.
From my understanding, this patent deals with instead of making the gains by using a diffractive element size of the lens, in this case, they want to use a diffractive optical element to reduce the weight.
Focal distance 584.99
F number 4.12
a half field angle (degree) -- 2.12
Image height 21.64
Whole length of the lens 474.74
BF 109.42
Focal distance 487.49
F number 4.12
a half field angle (degree) -- 2.54
Image height 21.64
Whole length of the lens 409.74
BF 98.42
Japan Patent Application 2019-008047
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