Canon is actively growing quick mirror lenses

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Mirror lenses have a foul wrap, as many of the implementations on the market are for lengthy and sluggish lenses, this patent discovered by asobinet footwear that Canon has been engaged on quick aperture mirror lenses.

Whether or not these ever make it to market stays to be seen.

Canon 300mm f/2.4 Mirror Lens

  • Focal size:298.89mm
  • F-number: 2.28
  • Half angle of view: 4.14°
  • Top: 21.64mm
  • Size Total: 177.20mm
  • Again Focus: 65.95mm

Canon 400mm f/5 Mirror Lens

  • Focal size: 408.04mm
  • F-number: 5.00
  • Half angle of view: 3.04°
  • Top: 21.64mm
  • Size Total: 189.17mm
  • Again Focus: 47.69mm

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