Sigma Patents 70-200mm f/2.8 DG OS HSM | Sports Lens Optical Design

According to the Egami Blog, Sigma has patented an optical formula for the 70-200mm f/2.8 DG OS HSM | Sports lens.
 
Patent Description
 

• Patent Publication No. 2016-75828
• Published 2016.5.12
• Submitted 2014.10.8
• Zoom ratio 2.67
• Focus distance 72.41 118.50 193.38
• F-number 2.92 2.92 2.92
• Field of view 2h 33.58 20.51 12.56
• Image height Y 21.63 21.63 21.63
• The total lens length 250.00 250.00 250.00