Canon Patent Application: APS-C Mirrorless Superzooms
An APS-C patent application has appeared for Canon mirrorless cameras.
With these three embodiments showing a very short backfocus, it's unlikely these lenses would be created for the RF mount.
Canon 18-240mm F4-8.0
focus distance 18.49 59.57 242.50
F-number 4.12 6.60 8.12
half-field angle 33.67 12.91 3.22
Image height 12.32 13.66 13.66
total lens length 123.50 155.31 187.11
BF 10.16 10.16 10.16
Canon 18-225mm F4-8.0
focus distance 18.57 59.27 225.00
F number 4.12 6.60 8.12
Half angle (degree) 33.56 12.98 3.47
Image height 12.32 13.66 13.66
total lens length 123.50 155.11 186.72
BF 11.44 11.44 11.44
Canon 18-200mm F4-8.0mm
focal length 18.59 52.07 199.98
F number 4.12 6.60 8.12
half angle 33.53 14.70 3.91
image height 12.32 13.66 13.66
total lens length 123.65 155.08 186.50
BF 13.00 35.85 45.58
The following embodiments do show a more RF typical backfocus distance, with a distance of 16.74mm and 15.91mm.
Canon 18-225mm F4-8.0mm
focal distance 18.60 56.56 225.00
F-number 4.12 6.60 8.12
half-field angle 33.52 13.58 3.47
image height 12.32 13.66 13.66
total lens length 126.19 157.98 189.78
BF 16.74 16.74 16.74
Canon 18-225mm F4-8.0mm
focus distance 18.77 54.34 224.98
F number 4.12 6.60 8.12
Half angle (degree) 33.28 14.11 3.47
Image height 12.32 13.66 13.66
Lens total length 125.34 159.37 193.39
BF 15.91 38.92 49.49
As with all patent applications, these are a work in progress and may never be approved for production. Are these the smoking gun for the RF APS-C camera? Probably not. Embodiments are rarely proof, they are simply illustrations. It does show that Canon is looking at fast APS-C auto focus super zooms though.
Japan Patent Application 2021-021774
5116