Four New Canon Telephoto Lens Patents: 2 x 400mm f/4, 600mm f/4 and 800mm f/5.6, all with macro)
Once more Egami (translated) spotted interesting new patents filed by Canon. A 400mm f/4 DO macro 1:1.4, a 400mm f/4 DO macro 2:1, a 600mm f/4 macro 1:1 and an…