Aperture and Depth of Field

 My learnings: 

An image with an aperture of 5.6 or less seems to be a bit blurred in the background. Whereas an image with an aperture around 25 seems to be in focus. 

Aperture essentially refers to the opening in the camera lens controlling the amount of light that passes/enters the camera. However, since the images look so similar with minute differences only, I'm still having difficulty understanding how it affects the image, other than the blurring. 

Shutter Speed: 1/80          Aperture: 5.0         ISO:200

Shutter Speed: 1/60          Aperture: 6.3         ISO:320

Shutter Speed: 1/60          Aperture: 8.0         ISO:500

Shutter Speed: 1/60          Aperture: 9.0         ISO:640

Shutter Speed: 1/60          Aperture: 11.0         ISO:1000

Shutter Speed: 1/80          Aperture: 13.0         ISO:1250

Shutter Speed: 1/60          Aperture: 16.0         ISO:2000

Shutter Speed: 1/80          Aperture: 18.0         ISO:2500

Shutter Speed: 1/60          Aperture: 20.0         ISO:3200

Shutter Speed: 1/50          Aperture: 22.0         ISO:3200

Shutter Speed: 1/40          Aperture: 25.0         ISO:3200

Shutter Speed: 1/30          Aperture: 29.0         ISO:3200


Shutter Speed: 1/25          Aperture: 32.0         ISO:3200


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