A new and interesting patent was revealed by Sigma and allude to a 400mm f/2.8, image-stabilized lens and however 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
Continue reading 400mm f/2.8 OS Sport Lens patent from Sigma