Northlight has uncovered a patent relating to a zoom lens design with two aperture stops. Within the patent are two different optical formulas, one for an EF 16-35mm f/2.8 and another for an EF 24-70 f/2.8. According to Northlight: The aim is to produce a zoom lens with constant minimum aperture, but having small variations Read more......
Published By: Canonrumors - Thursday, 28 June, 2018