ISO is just one third of the exposure triangle. But, it stands out as the most interesting due to the fact that year after year, camera manufacturers are making it easier and more feasible to shoot higher and higher ISOs.
To get down to the basics though, Tony Northup has shared an ‘Ultimate Guide’ to ISO.
In the 22-minute video, Northup covers the basic concepts of ISO and the various elements that every photographer should have in their knowledge bank. It’s a great resource for photographers new and old, full of details and outlooks that often get overlooked in the nitpicking and pixel-peeping of the digital age.

- [via Reddit]
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