In the following pictures of the three cameras and the lenses, I focused only on the middle camera, did not change the distance between the photographing camera and these subjects, but only varied the aperture.
You can see very well which image effects can be achieved by different apertures and how the depth of field changes!
The camera-lens combination shown individually shows you the lens with the aperture used to capture the images in each case.
In the first image, no aperture blades are visible because the aperture is completely open.
It's that simple! By applying these rules you will always have an important design feature for "better pictures" with you!
Small aperture (small f-stop) = high f-number = higher depth of field (e.g. f-stop 11 - 16 - 22)
Large aperture (large f-stop) = low f-number = less depth of field (e.g. f-stop 1.4 - 2 - 2.8)