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| Canon EF 400mm f/4 DO IS II lens |
Egami discovered a new Canon patent that may offer another hint to their widely expected full frame mirrrorless camera coming in either late 2016 or early 2017. Canon is very keen on Diffractive Optics technology and will be announcing more high end DO lens in the future. I cannot be happier since yours truly is a big fan of DO lens. Read my review of the EF 400mm f/4 DO IS II lens.
Patent Publication No. 2016-102851
- Published 2016.6.2
- Filing date 2014.11.27
Example
- Zoom ratio 1.00
- Focal length 31.35
- F-number 2.86
- Angle of view 34.61
- Image height 21.64
- Overall length of the lens 85.29
- BF 29.99
Canon patent
- Positive ShiboTadashi
- Diffractive optical element (the second group of aperture stop image side)
- Correct axial chromatic aberration and lateral chromatic aberration of the near-infrared light
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