Canon Patents

Patent: Optical Formula for New EF 24-70mm f/2.8L

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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 in lens aberrations when focusing near/far. The second aperture stop is varied as the lens zooms.

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