Howabout a 1000mm replacement for the EF 800mm f/5.6L IS? A patent showing the optical formula for an EF 1000mm f/5.6 IS DO has appeared.
We've seen the prototype for a future EF 600mm f/4 IS DO BR already, and the likelihood of seeing more DO lenses I think is pretty high. A 1000mm lens would be a great replacement for the current 800mm lens.
Patent Publication No. 2016-102852 (Google Translated)
- Published 2016.6.2
- Filing date 2014.11.27
- Zoom ratio 1.00
- Focal length 950.00
- F-number 5.80
- Angle of view 1.30
- Image height 21.64
- Overall length of the lens 485.94
- BF 0.40
- Canon patent
- Positive and negative Shibomake
- Diffractive optical element (first group)
- Inner focus (the second group)