Canon has filed a new patent for EF 600mm f/4 DO IS USM lens. The prototype of this lens was shown at Canon EXPO in September 2015. Thanks to the diffractive optics inside, the new EF 600mm f/4 DO IS lens is substantially shorter than the current EF 600mm f/4L IS II USM lens (Amazon, B&H). Last year, Canon announced the EF 400mm f/4 DO IS II USM lens, it’s really amazing! And this Canon EF 600mm f/4 DO IS USM Lens is expected to be announced in the second half of 2017.
Take a look at the patent details below (translated by Google):
Patent Publication No. 2016-200685
- Publication date 2016.12.1
- Application date 2015.4.9
- Focal length 585.00
- F number 4.12
- Half angle of view (degree) 2.12
- Image height 21.64
- Lens total length 335.32
- BF 66.92
- Effective front diameter 142.00
- 3 aspheric surfaces
- Super UD 2
See also: Best Canon Lenses for Wildlife Photography.