Patent: Canon RF 70-400mm f/4.5-5.6L IS USM and more

Canon News has uncovered a patent which details the optical formulas for a couple of super telephoto zooms, including an RF 70-400mm f/4.5-5.6L IS USM, Read more…

Original source: http://feedproxy.google.com/~r/canonrumors/rss/~3/ZIb1sSQI7uQ/

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