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Canon Patent: RF 16-30mm f/4-5.6 Lens For The EOR System

Canon Patent
Drawing from the patent literature

Here is another Canon patent application for an RF-mount lens, as usual spotted by asobinet.com.

Canon patent application 2021-148949 (Japan) discusses optical formulas for what seems to be a RF 16-30mm f/4-5.6 lens for the EOS R full frame mirrorless system. From the patent literature:

PROBLEM TO BE SOLVED: To provide a small and wide angle-of-view zoom lens having high optical performance in the entire zoom range, and an image pickup device and an image pickup system having the same.

[…] In recent years, a zoom lens used in an imaging device is required to have high optical performance in the entire zoom range, to be compact and to have a wide angle of view, as the imaging device becomes more sophisticated. As a zoom lens that is small and relatively easy to widen, a negative lead type zoom lens in which a lens group having a negative refractive power precedes (is located closest to the object side) is known. As a negative lead type zoom lens, Patent Document 1 discloses a zoom lens composed of first to fourth lens groups having negative, positive, negative, and positive refractive powers arranged in order from the object side to the image side. ing. Further, Patent Document 2 discloses a zoom lens composed of first to fifth lens groups having negative, positive, positive, negative, and positive refractive powers arranged in order from the object side to the image side.

If it hits the market, this is going to be an affordable lens for the EOS R system, like the recently released RF 16mm f/2.8 STM pancake lens.

Embodiment 1:

  • Zoom ratio 1.79
  • Wide-angle intermediate telephoto
  • Focal length 16.48 22.05 29.50
  • F number 4.12 4.79 5.61
  • Half angle of view (degrees) 55.80 44.90 35.80
  • Image height 21.64 21.64 21.64
  • Lens total length 100.88 99.27 100.51
  • BF 14.00 16.25 19.80

Embodiment 2:

  • Zoom ratio 1.79
  • Wide-angle intermediate telephoto
  • Focal length 16.48 22.05 29.50
  • F number 4.12 4.12 4.12
  • Half angle of view (degrees) 55.20 45.00 36.20
  • Image height 21.64 21.64 21.64
  • Lens total length 110.07 105.92 108.00
  • BF 12.80 17.50 21.37

More Canon patents are listed here. Some particularly interesting patent applications we think might get into production are these:

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