From Digital Camera World · · 1m 10s
Canon patent hints at 70-200mm f/2 lens
Canon's patent suggests a brighter 70-200mm f/2 lens could be possible.
In brief
Canon's patent suggests a brighter 70-200mm f/2 lens could be possible. Canon's patent shows a design for a compact 70-200mm f/2 lens using three focus groups. Originally reported by Digital Camera World.
Canon RF 28-70mm f/2L popularity
The Canon RF 28-70mm f/2L USM is a popular pro lens with an unusually bright aperture.
Recent patent details
A recent patent published in Japan on October 16 details a design for a compact high-performance zoom lens using three or more focusing groups.
Patent's 70-200mm f/2 reference
The patent references a potential 70-200mm f/2 lens among other lenses like a 50-85mm f/1.4.
Three focus groups benefit
Using three or more focus groups helps shorten the distance between optical groups for a brighter lens without significant size increase.
Canon's prior patent work
Canon previously explored using three focus groups to increase focusing performance in another patent this year.
28-70mm f/2L weight
The Canon RF 28-70mm f/2L USM weighs 3.1 pounds / 1430g, heavier than the RF 70-200mm f/2.8L IS USM.
Patent doesn't guarantee product
Canon's patent doesn't guarantee a real product, as many patents filed yearly don't become actual lenses.
In short
Canon's patent shows a design for a compact 70-200mm f/2 lens using three focus groups.
