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



Canon Patents 42x Zoom Lens!

Canon Patents 42x Zoom Lens!

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