Archive for: ef 1200 f/5.6L

Correction and History Lesson About Built-in Teleconverters in Canon Lenses

Correction and History Lesson About Built-in Teleconverters in Canon Lenses

Canon FDn 1200mm f/5.6L
I made a post a few days ago about built-in teleconverters and said that the EF 200-400 f/4L IS 1.4x was the first Canon lens with the built-in 1.4x teleconverter technology. While it will be the first production lens to have the feature, Canon did in fact make 5 lenses back in 1984 for the Los Angeles Summer Games in the form of an FDn 1200mm f/5.6L that also had a 1.4x teleconverter built in. All 5 of these lenses were shipped back to Canon in Japan and converterted to EF mount. These lenses then became the legendary made to order EF 1200 f/5.6L without the built-in teleconverter.

If you’ve never heard about the super rare Canon EF 1200 f/5.6L, Bryan at TDP has a great article about his time with the lens. Read it here..

Thanks for the heads up Phil

cr

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Canon Patents 42x Zoom Lens!

Canon Patents 42x Zoom Lens!

Wow!
The number of shots I’ve missed because I only have 35x zoom is staggering. It’s a good thing they’re working on something more!

That EF 1200 f/5.6L is starting to look overpriced.

4.36mm-180.0mm F2.54-5.74

 

Publication number Patent 2011-33868 (P2011-33868A)

Release date February 17, 2011 (2011.2.17)

Numerical Example

  • F = 4.36-180.0mm focal length
  • Fno = 2.54-5.74
  • 38.63-1.23 ° angle
  • Image height is 3.49-3.88mm
  • Total lens length 94.37-134.09
  • Back Focus 9.00-6.38
  • 41.24 zoom ratio
  • Two-sided aspheric

Optical system

  • Positive lead type zoom lens
  • Zooming, the object first and third groups, the group moved toward the second image
  • The third lens group for image stabilization
  • Expression rear focus lens group to focus on the fifth

cr

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