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<a href="http://www.northlight-images.co.uk/canon-ef-lenses-rumours-and-news/">Northlight</a> has uncovered a patent relating to a zoom lens design with two aperture stops.</p>
<p>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.</p>
<p><strong>According to Northlight:</strong></p>
<blockquote><p>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.</p></blockquote>
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