» There are myriad different settings that offer an equivalent level of exposure. As such, we can vary our shutter speed, aperture or ISO for creative results, while still keeping a balanced overall exposure. This is where stops of light can be hugely useful. For aperture, our f-stop intervals come at f/1.4, 2, 2.8, 4, 5.6, 8, 11, 16 and 22. Similarly, a halving or doubling of shutter speed or ISO is a stop of light. So we can add or take away a stop from either aperture, shutter speed or ISO for an equivalent exposure. For a 20-second shutter speed at f/16, ISO100, we can achieve an equivalent exposure by doubling ISO to 200 (+1 stop), and then halving the shutter speed to 10 seconds (-1 stop).
Our choice…
