What is ISO? (Photography)
!!!CORRECTION!!! When you increase the ISO, you amplify the signal of the image, not the sensitivity of the sensor...doh!.....but this does mean you can shine less light on it to get the same exposure....
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What is ISO?
ISO is one of your three settings that you can control your exposure with.
ISO stands for International Standards Organisation. They set a to of different standards so things can be rated around the globe. In photography, if you look it up, it refers to the industry norm for sensitivity of emulsion based film, with: 100 ISO being not so sensitive (and the standard ISO used by most people) to: 1600 ISO which is extremely sensitive to light.
So the name has come from the era of film and it has carried across to digital photography. In a digital camera it is where the voltage is increased across the sensor which amplifies the signal of the image. SO all you need to know is the higher the ISO, the more sensitive the camera will be to the light you expose it to.
In digital photography it refers to the amplification of the signal from the sensor and can be changed to bring your exposure up or down.
The more amplified the signal, the less light it needs to be exposed to to get the same exposure.
ISO 100 is the norm that you should be shooting on (unless your camera has a different base ISO). As it gets darker, you’d start to raise your ISO to be able to keep your shutter speeds up enough to still shoot handheld.
As you increase your ISO, the grain/noise of the image increases. Some cameras like the a7sii are really good and can handle really high ISOs and smaller sensor cameras like the iPhone are not that good. At high ISOs on these smaller sensors the image will start to fall apart.
Nowadays there are cameras that have invariant ISOs and non-invariant ISOs, click in the corner to learn about these. If your camera is ISO invariant….it does change the game a little.
And that's about it.
Thanks
Mike
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