According to the Egami Blog Canon has filed a patent for an EF 400mm f/2.8L IS USM Extender Lens.
If I’m reading the patent details correctly, this lens would feature user selectable extender settings of 1.4x and 1.7x. This could be a really interesting addition to Canon’s super telephoto lens lineup. [Sean]
Patent Details
If I’m reading the patent details correctly, this lens would feature user selectable extender settings of 1.4x and 1.7x. This could be a really interesting addition to Canon’s super telephoto lens lineup. [Sean]
Patent Details
- Patent Publication No. 2016-191761
- Published 2016.11.10
- Filing date 2015.3.31
- The main lens
- Focal length 392.57
- F-number 2.90
- Angle of view 3.15
- Image height 21.64
- Overall length 371.15
- BF 44.00
- Example 1
- The first state magnification 1.40
- The second state magnification 1.70
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