@ Scaff. Your advice is correct 👍 but the wording isn't.
f22 is considered by photographers to be a small aperture and 1.4 to be a large one.
The official notation would be 1/22 (0.04545) and 1/1.4 (0.71). However no-one uses that and its become f22 and f1.4.
To work out how big the 'hole' is you take the "length" of your lens and divide it by the apt number.
100 mm lens / f22 = 4.5mm opening
100 mm lens / f5.6 = 17.8mm opening
50 mm lens / f1.4 = 35.7mm opening
50 mm (Canon) / f1.0 = 50mm opening
AMG