Recent patent we have seen Canon is working on super zoom lenses for its Fullframe Mirrorless and Fullframe DSLRs camera. One of the most the most important attractive then we have seen is the 25 to 300 mm lens which covers Almost 90% of starting from Wide Angle shots to telephoto.
Canon Fullframe Mirrorless Lens Patent
1.Focal distance: 29.22 – 350.06 F 2.8 – 4.5
- – 4.50 – Half angle of view: 32.15
- – 3.5 – Image height: 18.36
- – 21.61 – Total length: 406.68
- – 406.68 – Back focus: 22.42 – 22.42
2.RF 25-300 mm F 3.5-5.6
- – Focal distance: 25.20-294.41
- – F value: 3.50
- – 5.60 – Half angle of view: 36.72
- – 4.20 – Image height: 18.80
- – 21.61 – Total length: 374.08
- – 374.08 – Back focus: 21.75 – 21.75
As you can see the details of the two above lenses having shorter Back Focus distance. One lens is focal length of 25-300mm with aperture ange F6.5-F5.6 and other lens we have in the list is the 30mm to 350mm with aperture range F2.8-F4.5. Literally with bit extra wide coverage the 25-300mm Lens is commercially more usable than the 30-350mm lens.
Not only the above two lenses we also have two DSLRs lenses those who give extreme coverage, you can say these lenes are being inspired from Canon EOS Cinema (PL Mount) lenses.As usually PL Mount lenses give extreme coverage but they are costly too.
Canon Fullframe DSLRs Lens Patent
1. Canon EF 35-350 mm F 3.5-5.6
- – Focal length: 35.04-350.37
- – F value: 3.50
- – 5.60 – Half angle of view: 30.36
- – 3.5 – Image height: 20.53
- – 21.61 – Total length: 321.17
- – 321.17 – Back focus: 40.10 – 40.10
2. Canon EF 35-400mm F 4.5-5.6
- – Focal distance: 35.13 – 386.45 – F value: 4.50
- – 5.60 – Half angle of view: 30.30
- – 3.20 – Image height: 20.53
- – 21.61 – Total length: 362.82
- – 362.82 – Back focus: 54.68 – 54.68
But as you can see the Focal length of both the lenses are exactly same at wider end starting from 35mm bit at tele end one is having 350mm coverage and other having 400mm coverage. The Lens made of Canon Fullframe DSLRs having 35-350mm focal length and aperture range F3.5-5.6 look bit more usable to me compared to 35-400mm lens with F4.5-5.6 aperture.
By looking at these patent data one thing is sure that Canon really planned something great for thir mirroless fullframe camera as well as Fullframe DSLRs. Which lens is your fav lens among the list of four lenses do share with us.
Canon Patent – DSLRs with In-Body Image Stabilization
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