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Canon Patent Application: DO Supertelephotos
Another patent for diffractive optics (DO) super telephotos has appeared. This seems to be a subject of ongoing R&D inside of Canon, with several patent applications listed for these lenses using diffractive optics.
There was a rumor about super telephotos for the RF mount using Diffractive Optics, perhaps this is related. For supertelephoto lenses, the back focus is so large, that the lens could be made for just about any mount.
This patent application describes two lens embodiments, one for a 300mm 2.8 and another for a 400mm 2.8 DO supertelephoto.
Focal distance 392.58
F number 2.91
a half field angle 3.15
Image height 21.64
length of the lens 363.53
BF 59.15
Focal distance 293.40
F number 2.91
a half field angle 4.22
Image height 21.64
length of the lens 274.00
BF 59.35
Japan Patent Application 2018-189878
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