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Canon News has uncovered a new optical formula patent for a Canon RF 28-70mm f/2.8. Canon seems to have worked quite hard at reducing the size of such a design significantly. The design in this patent is actually smaller than the highly-regarded Tamron 28-75mm f/2.8 Di III RXD for the Sony E mount.
Canon has a couple of lenses already covering this focal length, such as the RF 28-70mm f/2L and the RF 24-70mm f/2.8L IS, but as we saw with the EF mount, the EF 24-70mm f/4L IS was quite a popular option for people that didn’t want the size, expense or speed of the EF 24-70mm f/2.8L II.
With the EF 24-70mm f/4L IS being discontinued, there is likely a need for a smaller 24-70 type lens for the RF mount. The lens design in this patent is only about 1cm longer than the EF EF 24-70mm f/4L IS, but has the bonus of having an extra stop of light. Could this be a less expensive non-L zoom?
Japan Patent Application 2021-156963
- Focal length: 28.84mm 37.17mm 67.90mm
- F number: 2.91 2.91 2.91
- Half angle of view: 32.65° 28.90° 17.67°
- Image height: 21.64mm 21.64mm 21.64mm
- Total lens length: 122.81mm 111.18mm 132.62mm
- BF: 21.92mm 26.79mm 39.84mm