Canon recently filed a new lens patent for EF 600mm f/4 DO IS USM lens. This is another super telephoto prime DO lens. Last year, Canon announced the EF 400mm f/4 DO IS II USM lens, price for $6,899, currently in stock at Amazon.
EF 600mm f/4 DO IS USM Lens Patent:
- Patent Publication No. 2015-11171
- Published 2015.1.19
- Filing date 2013.6.28
- Example 2
- Focal length 588.30mm
- Fno. 4.12
- Angle of view 2.11 °
- Image height 21.64mm
- Lens length 397.80mm
- BF 2.02mm
- Positive ShiboTadashi
- Inner focus
- Vibration control
Back in 2013, Canon already filed this lens patent:
via: EG
Read More: Canon Rumors