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The Effect of Changing ISO on Depth of Field

We’re used to upping the ISO to speed up the shutter speed, but few people consider what it’s going to do the aperture. Increasing the ISO makes the camera more sensitive, so allows a faster shutter or a smaller aperture, which changes the depth of field.

Like this:

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1/8000th, f2.8, 400ISO

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1/8000th, f5.6, 1600ISO

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1/8000th, f13, 6400ISO

You can see that the droplets stay the same, but the background comes into focus as the ISO increases.

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