This is my ISO noise test, I gathered a few things from around my room and put them under a broken light so that I could test the noise in a variety of colours, shadows, and highlights. I have included the photos below as well as a magnified version(x100) so that you can see more clearly, the effect that the noise has on the photos.
You get no noise at ISO100 and 200 and even at ISO1000 you get very little to no noise and I think that the images are still usable. However as soon as you hit 6400 and above the noise in the images becomes a lot more noticeable and the photo starts to break apart and become patchy, I think that the photos would still be usable for small prints but you defiantly couldn't blow them up too big. At the highest ISO my camera goes too, ISO102400, the whole photo becomes patchy and full of noise and is completely unusable.
1/4s
f/5.6
100 iso
1/8s
f/5.6
200 iso
1/40s
f/5.6
1000 iso
1/250s
f/5.6
6400 iso
1/4000s
f/5.6
102400 iso
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