Aperture – Why, When, How
Aperture is very strange to me, some times some things just click and I understand why and how… but with aperture, I havent found any good information that explains why things happen differently using different settings, sure, I know what the result is going to be, but WHY? I have searched everywhere on the internet, read a few books, not only on photography, but on optics, raytracing, maths…
I will explain what the numbers are and what they do, I will show some images I took to show the difference, and I will try and explain the physics behind it. I am not sure how technical this will be, because I dont know as I am writing this, so lets get started…

Aperture size from wide to narrow, the bigger the hole the more light gets in which means we can keep the shutter open less time.

Actual aperture opening on a lens

Focus on the closest object; HAWX, Aperture at the widest, f/3.5, shutter time, 0.2sec
bla bla bla

Focus on the closest object; HAWX, Aperture at the narrowest, f/22, shutter speed, 5sec
bla bla bla bla

Focus on the farthest object; Vegas, Aperture at the widest, f/3.5, shutter speed, 0.2sec
bla bla bl bla

Focus on the farthest object; Vegas, Aperture at the narrowest, f/22, shutter speed, 8sec
bla bla bla bla