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A patent showing the optical formula for a Sigma 70-200mm f/2.8 OS Sport lens has appeared.
Patent Publication No. 2016-75828
- Published 2016.5.12
- Filing date 2014.10.8
- Zoom ratio 2.67
- Focal length 72.41 118.50 193.38
- F-number 2.92 2.92 2.92
- Full angle of view 2ω 33.58 20.51 12.56
- The image height Y 21.63 21.63 21.63
- The total lens length 250.00 250.00 250.00
This lens along with a new 24-70mm f/2.8 OS Art have been long expected from Sigma.