Here is a new Canon patent application, as usual for RF-mount lenses. Canon patent application…
Sigma patent for 400mm f/2.8 OS Sport Lens
Egami (translated) spotted an interesting patent filed by Sigma. It refers to a 400mm f/2.8, image-stabilized lens. This lens will be part of Sigma’s “Sport” line-up.
- Patent Publication No. 2015-64436
- Published 2015.4.9
- Filing date 2013.9.4
- Example 1
- Focal length 390.00mm
- Fno. 2.91
- Total angle of view 2ω 6.29 °
- Image height Y 21.63mm
- Overall length of the lens 353.00mm
- Positive, positive positive and negative negative 5-group configuration
- Inner Focus (fourth group)
- Anti-vibration (part of the fifth group)