iso vs f-stop vs shutter speed

[tmcthree]

Hey all

Apologies for the noob question but...

When using the physical camera, I'm wondering if there's any qualitative difference in using f-number, iso or shutter speed to darken or lighten the image?

For example,
I increase the f-number, that darkens the image.
I increase the iso number and that lightens the image.

Have these two actions just cancelled each other out, or is there some difference, under the hood, that will create a different looking image?
For example, will there be more contrast in one image than another?

I've tried experimenting, but it's difficult to know for sure.

Thanks in advance

[chuckie7413]

It depends if you are using depth of field or motion blur. Changing the fstop would also effect the depth of field like a real "physical" camera. If you are not using depth of field or motion blur then it makes no difference if you adjust the fstop, shutter speed or the iso. It is just acting as an exposure control. Should be no visual difference between them.

[glorybound]

It does sound complicated, but it isn't. Low F-Stop for DOF and you'll need to adjust the Shutter Speed because your scene will be over bright. If you want motion blur you'll need to play with shutter speed and adjust your F-Stop or ISO to adjust for light.

https://www.zippi.co.uk/thestudio/manual-photographers-cheat-sheet-infographic/

[Ihno]

In reality the iso indeed has an influence on the contrast but I assume in vray this isn't simulated in order to keep the image linear. (?)

[vlado]

In reality the iso indeed has an influence on the contrast but I assume in vray this isn't simulated in order to keep the image linear. (?)

This is correct.

Best regards,
Vlado

[tmcthree]

Thanks guys, that answers my question. I'm not using motion blur or dof. In fact I'm baking textures for game objects. So from my point of view, f-number, iso and shutter speed would have exactly equivalent.effects on the image.