Exposure In Photography
Exposure, it's the most important factor in any photo. End of statement.
It's often neglected as we are looking for the ultimate quality and that leads us to set our ISO at base – usually 100 or 200 – and try to forget about it. The thing is though, modern cameras are so good at controlling noise that we can get great images all the way up to 3200 ISO with very little noise in them.
Because of this, we should be considering ISO as an important way of controlling exposure. There is a way we can control ISO automatically, like shutter priority and aperture priority. It’s called, not surprisingly, Auto ISO and it can be a brilliant addition to our exposure armoury, especially when shooting in tricky or low light conditions.
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What Is Auto ISO?
Auto ISO allows us to set specific parameters on how ISO interacts with shutter speed. It is present on virtually all modern cameras and as well as having a fully automatic setting it also allows us to set a both a minimum shutter speed and maximum aperture.
How It Works In-Camera
When shooting in one of the automatic modes, shutter or aperture priority or program the Auto ISO function will monitor your exposure. If the light levels start to fall, so will your shutter speed, if that shutter speed reached the minimum that you have set, it will start to increase the ISO to give you the correct exposure.
It will do that all the way up to the maximum ISO that you have set then warn you that you need to change.