Check out this post from Stephen Dennstedt’s blog with the topic: Photography 101: What Is Your High ISO Tolerance
When is your camera’s high ISO too high? That’s a difficult question to answer. I think it depends on your tolerance for high ISO images, the subject of the photograph, and how the photo is eventually going to be viewed. If you’re a photographer then hopefully you have a pretty good understanding of what ISO is and how it’s used. Basically, it’s your camera sensor’s sensitivity to light and it generally corresponds to film speed (what we called ASA). The higher the ISO the more sensitivity to light, which allows photographers to shoot in darker conditions. But there is a tradeoff—photography has always been about compromise.
The downside is, with higher ISO, more noise (what we called film grain) starts to appear in your image—especially in the shadows. Modern digital cameras have really improved in this area and are capable of producing acceptable results at…
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