10-05-2019, 08:57 PM
By the way, the optical formula of the Olympus M.Zuiko Digital ED 45mm f/1.2 Pro was patented by Sigma (so were those of the 75mm f/1.8 and 25mm f/1.2 Pro). The patent request was filed by Sigma on the 24th of July, 2017 (2017-142519) and published on the 14th of February, 2019 (2019-023693).
Olympus lens.
Example 1 in the patent (the three other ones are similar).
Olympus lens.
Example 1 in the patent (the three other ones are similar).