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Continue to ChatPatents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6 https://www.canonrumors.com/patents-28-135-f4-5-6-28-300-f3-5-5-6/
Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6 https://www.canonrumors.com/patents-28-135-f4-5-6-28-300-f3-5-5-6/