ISO

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The Best ISOs For Shooting Video Come In Multiples Of 160

With the rise in the use SLRs to record video as well as the capabilities of simulated ISOs, the question has to be asked if ISOs really do link perfectly with noise levels?
- By Tim Barribeau on May 3, 2011
Andrew Schär put together this demonstration after reading a document calling for the use of ISOs that are multiples of 160 when shooting video with his Canon DSLR, which prompted him to test just how much the simulated ISOs in between full steps make a difference. Using his Canon 60D, he recorded a full range of ISOs, and found something that's pretty different to the assumed proportional relationship between ISO number and noise levels.
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How To: Understand Noise

What’s with that grain and mottling?
- By Dan Richards on October 20, 2010
Say you’re tuning a radio to a station with a weak signal. You turn up the volume and hear static. Why? By amplifying the signal, you’re also amplifying unwanted stray electronic bits: audio noise.Electronic noise in digital photos has the same cause: Amplify a weak signal from an imaging sensor too much, and you also amplify stray electrons in the sensor or elsewhere in the circuitry. It shows up in your pictures as coarse grain (sometimes okay) or color mottling (often pretty ugly).
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