JimK Photo | ISO explained

ISO explained

May 06, 2018  •  Leave a Comment

F9BC0939-8999-4B91-B34B-48907A7ECF23ISO control on a Canon G11. Photo by Canon.

Hello, Lifetime Learners

I found this post on F-stoppers website that explains ISO very well. It’s not a perfect post. The author claims that raising the ISO increases the brightness of the capture. It does not. It increases the sensitivity of the sensor and amplifies the ability of the sensor to respond to light, like turning up the volume on a radio. For a given aperture, raising the ISO requires a higher shutter speed to provide a correct exposure; or, for a given shutter speed, raising the ISO requires the aperture to be closed down (higher f/stop number). And, like a radio, the higher the volume the higher the “hiss” background noise. That’s the increase in grain-like artifacts in the image that degrades quality, as ISO is raised. After you wrap your head around this concept, the rest of the article is quite accurate.

You might also want to glance at the comments that follow the story. I’m always amazed at how uncivil these discussions can be and the astonishing lack of knowledge and experience form many who post. 

fstoppers article on choosing ISO


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