Patent: More diffractive optics super telephoto lenses
I'll be honest, the first 20 or so patents relating to diffractive…
Canon EF 800mm f/5.6 DO IS in Development? [CR2]
When Canon updated the EF 400mm f/4 DO IS with a verison II,…
I'll be honest, the first 20 or so patents relating to diffractive…
When Canon updated the EF 400mm f/4 DO IS with a verison II,…

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