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Canon Patent Application: Canon RF 24-70mm Kit lens
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Canon Patent Application: Canon RF 24-70mm Kit lens

One thing I'd love is a nice small kit lens for the RF system. This lens seems to fit the bill as it describes a 24-70mm kit lens with variable aperture.

Unfortunately as with most of Canon's lens patents for the RF mount, making it small comes with a cost, and this cost is wide-angle performance as the lens has to stretch the image circle.

Some of the embodiments are shown below essentially this lens is around 80mm in lenght.   Consider that the 24-105 kit lens is 115mm, this is around 35mm smaller in length.  So nice and compact.

Canon RF 24-70mm F4-7.3

focal length       24.86  38.85  68.13  
F-number            4.12   5.10   7.31  
Angle of           38.31  29.11  17.62  
Image height       19.64  21.64  21.64  
total lens length 102.91  97.95 104.95  
BF                 13.00  22.13  37.46  

Canon RF 28-70mm F4-7.3

Focus distance     28.68  42.81  67.45  
F number            4.12   5.25   7.16  
Angle              34.41  26.81  17.78  
Image height       19.64  21.64  21.64  
total lens length 102.53 115.51 105.26  
BF                 13.00  20.64  36.88  

Japan Patent Application 2021-196449

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