Archive for: 200 f/2

Canon Files a Patent for a Bunch of Lenses.

Canon Files a Patent for a Bunch of Lenses.

All at once!
Canon has filed patents for a bunch of fast aperture telephoto lenses.

We’ve heard a number of times that Canon will update a lot of current lenses in 2012 and beyond. I think the 50 f/1.4 is the one that is in the most dire need of an update. An 85 1.2L III with a faster AF would also be welcomed. I hope they don’t update the 200 f/2L IS, I already love it and I would be forced to love the next one too at $6K+.

  • 50 f/1.4
  • 85 f/1.8
  • 85 f/1.2
  • 100 f/2
  • 135 f/2
  • 200 f/2

Patent literature, self-interpretation and summary

  • Patent Publication No. 2011-253050
  • Published 2011.12.15
  • Filing date 2010.6.2
Example
Example Focal length Fno Length Lens BF Lens Construction
One 85.00 1.24 126.06 39.13 Nine elements in 7 groups
Two 85.00 1.80 113.00 42.34 Nine elements in 7 groups
Three 100.00 2.00 120.00 42.27 Nine elements in 7 groups
Four 133.30 2.06 158.90 51.86 10 sheets in 7 groups
Five 196.00 2.05 223.50 50.00 15 pieces in 10 groups
Six 51.70 1.41 89.92 39.00 Eight elements in 7 groups

Both the image height is 21.64mm (full size)

Read More at Egami (Japanese)

Source: [PR] via [EG]