Patent: Canon EF 100-400 f/4.5-5.6 DO
A new patent showing an optical formula for an EF 100-400 f/4.5-5.6…
Patent: 600 f/4 DO IS & 400 f/2.8 DO IS
Patent Time! More diffractive optic patents from Canon. This time, another 600…
Patent: New Diffractive Optic Patents
More DO Lenses? A few patents in regards to diffractive optics have…
Diffractive 200 f/2, 300 f/2.8, 400 f/2.8, 600 f/4 Patent
Patent literature, self-interpretation and summary A lot of diffractive optics patents have…
Patents: Diffractive Optic 2.0x & 1.8x Teleconverters
Patent Publication No. 2011-123336 2011.6.23 Release Date 2009.12.11 filing date Related 2011-123334
Patent – EF 28 f/1.8 DO & Others
Canon files patent for new DO lenses Patent publication 2009-198960 Published 03/09/2009…
