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Canon Patent Application: More diffractive optics super telephotos
Canon it seems is not quite done with researching diffractive optic patents, even though the 600/4 DO that we saw on prototype is starting to seem like a unicorn.
This is a new patent application with the entire range of super telephotos from 400, 600 and 800mm listed as embodiments.
Focal distance 582.00
F number 4.12
Half field angle (degree) 2.13
Image height 21.64
Whole length of the lens 394.25
BF 62.79
Focal distance 405.00
F number 4.12
Half field angle (degree) 3.06
Image height 21.64
Whole length of the lens 330.16
BF 50.46
Focal distance 795.00
F number 5.60
Half field angle (degree) 1.56
Image height 21.64
Whole length of the lens 490.24
BF 105.13
Japan Patent Application 2019-028317