Archive for: 300 f/4

Patent: 400 f/4, 300 f/4, 200 f/5.6

New Lens Formula Patents
A new 400 f/4L IS non-DO would probably be a very welcomed lens. However, it will probably depend on the price of the 200-400 f/4L IS 1.4x ($8000+ I predict) as to whether or not it ever sees the light of day. The 200 f/5.6 is a strange one.

Patent Publication No. 2012-22105

  • 2012.2.2 Release Date
  • 2010.7.14 filing date

Example 1

  • 392.00mm focal length
  • Fno 4.12
  • 3.15deg half angle of view.
  • Image height 21.64mm
  • Length 279.32mm lens
  • BF 64.82mm
  • 15 sheets of 12 group configuration
  • An aspherical surface
  • Inner focus
  • Telephoto ratio 0.71

Example 3

  • 200.00mm focal length
  • Fno 5.77
  • 6.18deg half angle of view.
  • Image height 21.64mm
  • Length 180.00mm lens
  • BF 54.98mm
  • 6 lenses in 5 groups configuration
  • Telephoto ratio 0.90

Example 4

  • 294.00mm focal length
  • Fno 4.14
  • 4.21deg half angle of view.
  • Image height 21.64mm
  • Length 239.85mm lens
  • 14 images in 9 groups configuration
  • An aspherical surface
  • Inner Focus
  • Telephoto ratio 0.815
  • Telephoto lens
  • Stretch the focal length, and miniaturized, on-axis chromatic aberration and lateral chromatic aberration occurs
  • Tele photo lens type refers to the overall length is shorter than the focal length
  • And telephoto ratio refers to the value obtained by dividing the focal length the total length
  • Canon’s patent
  • Using the lens refractive index distribution

 Source: [EG]



A Random Roadmap: Lenses & Bodies [CR1]

A Random Roadmap: Lenses & Bodies [CR1]

I received a roadmap of sorts recently. The information went on to describe what’s going on with a few of the new lenses supposedly coming from Canon, as well as some camera body information.

135 f/2L II
There is a replacement in development, and a prototype exists. However, it is not slated for release for a year or two. The current 135L sells well, and is very high performance.

35 f/1.4L II
The prototype exists and is slated for a 2011 announcement.

24-70 f/2.8L II
Apparently 5 versions of this lens exist. A few even have IS. It is slated for a 2011 announcement. The patent we’ve seen says no IS.

300 f/4L IS II
Expect this lens to arrive sometime in 2011 or early 2012. If what is mentioned next is true, then f/4 lenses may become more in demand as photographers aim to carry a lighter camera bag.

The 1.3 crop will be going away. All cameras going forward will be APS-C and full frame. The ISO performance of upcoming cameras from Canon will be industry leading. This is in part because of sensor technology advancements as well as DIGIC V.

CR’s Take
All of this is pretty plausible. I do expect Canon to have a couple of surprises up their sleeves. We’ve seen that recently with the zoom fisheye and the 200-400 with the 1.4 teleconverter built in.