Canon is full steam ahead as far as lens development goes, as a whole slew of optical formulas have appeared at patent offices.
These are the latest EF mount optical formulas. It’s possible that these are Cinema lenses as they appear to be close to parfocal.
Japan Patent Application 2019-066585
Canon EF 16mm f/1.4
Focal distance 16.40mm 16.36mm 16.21mm
F number 1.45 1.45 1.45
Half field angle 52.84° 52.84° 52.84°
Image height 21.64mm 21.64mm 21.64mm
Whole length of the lens 98.97mm 98.65mm 97.42mm
BF 38.50mm 38.83mm 40.05mm
Canon EF 20mm f/1.4
Focal distance 20.50mm 20.45mm 20.26mm
F number 1.45 1.45 1.45
Half field angle 46.54° 46.54° 46.54°
Image height 21.64mm 21.64mm 21.64mm
Whole length of the lens 100.04 99.55 97.71
BF 38.32mm 38.81mm 40.64mm
Canon EF 14mm f/1.8
Focal distance 14.40mm 14.38mm14.29mm
F number 1.83 1.83 1.83
Half field angle...
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