Is Changing ISO Just Adjusting for Incorrect Sensor Exposure?

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sshapiro Forum Member • Posts: 50
Is Changing ISO Just Adjusting for Incorrect Sensor Exposure?
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After about 20 years of not engaging in much photography, I returned to it about a year ago via Fujifilm. While refreshing my knowledge of photography, I have seen explanations that ISO is part of the "exposure triangle," but that doesn't seem correct to me.

Since exposure happens at the sensor, before ISO gain is applicable, it seems that shutter speed, aperture size, and available light are the components that impact exposure. Isn't changing ISO just a way to help compensate for over or under exposure that happens at the sensor?

From what I have learned about ISO, through reading and use, it seems to function similar to an audio amplifier while available light, shutter speed, and aperture work together to produce the music track (image) being made audible by the amplifier.

Am I misunderstanding something about the function of ISO gain?

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