Archive for: EF 600 f/4 DO IS

Patent: Canon EF 600 f/4L IS III & EF 600 f/4 DO IS

Patent: Canon EF 600 f/4L IS III & EF 600 f/4 DO IS

A new patent showing the 600mm f/4 optical formula. Is Canon already working on the replacements to the current super telephoto lenses? It’s quite possible! Although I suspect we’re talking 7-10 years from now. These sort of patents could also be for technology that will appear in  other lenses. Such as the upcoming replacement of the EF 800mm f/5.6L IS.

I do expect we’ll be seeing more DO lenses in the future. There seems to be an awful lot of patents for DO optical formulas. I suspect the cost of production is the hinderance to bringing these lenses to market at the present time. We already have $11,000 200-400 f/4 lenses and $18,000 800mm lenses. I suspect we’re at the ceiling of what people will pay for a lens…. or not. :)

Patent Publication No. 2014-26210

  • Publication date 2014.2.6
  • Filing date 2012.7.30

Example 1

  • Focal length f = 588mm
  • Fno. 4.12
  • Angle of view 2ω = 4.22 °
  • BF 56.0mm
  • Total lens length 374.7mm
  • Inner focus

Example 5

  • Focal length f = 588mm
  • Fno. 4.12
  • Angle of view 2ω = 4.22 °
  • BF 55.0mm
  • Total lens length 343.5mm
  • Inner focus
  • Diffraction optical element
  • Effect of the glass material
  • Fluorite (Fluorite)
  • In the long lens fluorite + total length, correction of chromatic aberration is easy
  • In short lens fluorite + total length, correction of chromatic aberration is difficult
  • Diffractive optical element (DOE)
  • Diffractive optical element can be corrected if the chromatic aberration
  • Flare caused by light diffraction

Source: [EG]

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