Canon News has uncovered a patent with optical formulas for an RF 70-200mm f/2.8 and RF 70-200 f/4. What's interesting about this patent is that both designs are for inner zoom lenses, which is different than the current RF 70-200mm f/2.8L IS USM which as you know has an external zoo, which does help keep the lens compact when in your bag and in your hand.

It would be pretty cool if Canon gave photographers a choice of which design they'd prefer to buy, but I think the chances of that are quite slim.

Canon RF 70-200mm f/4.0L 

  • Focal length 72.00mm 133.20mm 194.00mm
  • F-number 4.10 4.10 4.10
  • Half angle of view (degrees) 16.72 9.23 6.36
  • Image height 21.64mm 21.64mm 21.64mm
  • Total lens length 202.98mm 202.98mm 202.98mm
  • BF 38.71mm 38.71mm 38.71mm

Canon RF 70-200mm f/2.8L

  • Focal length 72.00mm 133.20mm 194.00mm
  • F-number 2.88 2.88 2.88
  • Half field angle (degrees) 16.72 9.23 6.36
  • Image height 21.64mm 21.64mm 21.64mm
  • Total lens length 228.54mm 228.54mm 228.54mm
  • BF 24.36mm 24.36mm 24.36mm
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