We didn’t think the built in extender on the EF 200-400mm f/4L IS 1.4x was going to be a one off. Now a patent showing an optical formula for a new EF 400mm f/2.8L IS with a 2 stage built in extender has appeared. This would give the lens a focal range of 400mm, 560mm […]
from Nikon Digital SLR Camera With Lens
via Patent: Canon EF 400mm f/2.8L IS With Built-in 1.4x and 1.7x Extender
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