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Canon Patent Application: Focal Reducers for Mirrorless Cinema
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Canon Patent Application: Focal Reducers for Mirrorless Cinema

In this patent application, Canon describes some focal reducers that can create some very wild lenses for mirrorless cameras.

My only thoughts on this are that these designs are meant for super-35 cinema sensors in an RF mount since the image height is slightly larger than the normal image height for APS-C (13.66mm).  These adapters would also not even fit on your RF still camera as they ingress into the mount quite a bit (up to 1cm!).  

So it's very safe to conclude that these designs are certainly not for your normal APS-C RF mount cameras.  This would also fit with Canon's current speed booster as they state it cannot be used on the RF still cameras.

The reference lens used to get these reduced focal is the 50mm F1.4 full-frame EF lens.  The total lens length would include both the 50mm lens, the focal plane distance (20mm), and the reducer.

Canon Mirrorless Reduced 40mm F1.1

focal length         40.14
F-number              1.13
half angle           20.24
Image height         14.80
Lens Overall length  93.90
BF                   11.81

Canon Mirrorless Reduced 35mm F1.0

focal length         36.54
F-number              1.03
half angle           22.05
Image height         14.80
total lens length    91.95
BF                   10.70

Canon Mirrorless Reduced 32mm F.95

Focal length         33.45
F number              0.94
Half angle of view   22.42
Image height         13.80
Lens total length    91.91
BF                    9.73

Japan Patent Application 2021-167921

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