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Can someone explain how ISO/Base ISO functions these days? (alien.top)

submitted 11 months ago by Spirit-Subject@alien.top to c/photography@viewfinder.pro

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So generally, I’ve always understood that the lowest ISO is best to shoot at. Though with newer cameras, they usually have a higher base ISO and in some cases Dual ISO.

I usually work with the R5C, even for photography. It feels odd to take portraits at 800 ISO because I’ve always been told it should be as low as possible.

So does the Base ISO system, negate the need to shoot at lowest ISO for the clearest and least grainy image?

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[–] TinfoilCamera@alien.top 1 points 11 months ago (1 children)

Iso causes noise.

Oh for crying out loud.

Stop spewing the Bs northrup Invents.

Difficulty: He didn't invent that, he literally parroted it.

Ultra bright outdoors, shoot at 1/4000 f22 iso 26000 it will be noisy. And don't give me the "1/4000 f22 makes little light hit the sensor, it's lack of light"

OK - I won't.

Little green men from Mars caused the noise!

OR... it could just be Signal vs Noise and if you do not have enough signal you will have noise... and all the signal you will ever have is gathered before ISO is applied.

Thus it is proved - all the noise is also gathered before ISO is applied.

Lack of light makes you use high iso to expose correctly, therefore noise. Of course

You realize you just reversed your position, right? Lack of light does indeed force you to use high ISO, and that lets you see the noise that was already there.

[–] X4dow@alien.top 1 points 11 months ago (1 children)

Use that same low light scenario. Shoot at iso 100. And you get a perfectly clean black exposure.

See, low light, no noise. So low light doesn't equal noise.

Boosting iso to get the exposure right when there is a lack of light. Does, as you expose the noise too

[–] Sneezart@alien.top 1 points 11 months ago

I wasn't going to get involved in this one as well but here we go.

In this scenario, if you kept the ISO at 100 but instead of increasing ISO, you kept the shutter open for longer, you will also get a perfectly exposed image with minimal noise. If noise was inherent to low light scenarios, you would be capturing more of it because your sensor would be exposed to that noise for longer, but that's not the case.

And yes, you would still get a small amount of noise (and hot pixels), but that's thermal noise from keeping the photovoltaic sensors exited for a longer period of time.