"Fixed Portrait Shoot"

ISO 100

Aperture 18

Sutter Speed 1/40

ISO 400

Aperture 20

Sutter Speed 1/80

ISO 800

Aperture 25

Sutter Speed 1/80

ISO 3200

Aperture 25

Sutter Speed 1/320

ISO 1600

Aperture 25

Sutter Speed 1/125

1- My best ISO to use on my portraits was 1600 ISO.

2- The next best photo was the ISO 3200.

3- When I put higher numbers my pictures went better.

4- I learn that the higher number is best when is light.