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<blockquote data-quote="Rexer John" data-source="post: 120587" data-attributes="member: 12691">Not just his opinion, that's exactly what it does.ISO is a term used for the speed of film (how quickly it reacts with light). Higher speed film was more grainy and gave lower &quot;resolution&quot;. Similar in a way to higher digital ISO.The digital age has continued using the same equivalent rating for the image sensor for easy comparison..Talking digital only now. At the cameras native ISO the sensor is running without any amplification.As you increase the ISO, the sensor is being amplified above it's natural (native) ability.Just like amplifying sound causes background hiss or distortion, amplifying the cameras image sensor causes unwanted anomalies. We call it noise even though it's not sound distortion.The more you amplify an image, the more the anomalies show themselves.The camera sensors and the amplifying hardware/software as so good that the &quot;noise&quot; is not visible until much higher ISO values than just a few years ago.ISO will never be better than glass but it will always help any lens when conditions get tricky.</blockquote>

[QUOTE="Rexer John, post: 120587, member: 12691"] Not just his opinion, that's exactly what it does. ISO is a term used for the speed of film (how quickly it reacts with light). Higher speed film was more grainy and gave lower "resolution". Similar in a way to higher digital ISO. The digital age has continued using the same equivalent rating for the image sensor for easy comparison.. Talking digital only now. At the cameras native ISO the sensor is running without any amplification. As you increase the ISO, the sensor is being amplified above it's natural (native) ability. Just like amplifying sound causes background hiss or distortion, amplifying the cameras image sensor causes unwanted anomalies. We call it noise even though it's not sound distortion. The more you amplify an image, the more the anomalies show themselves. The camera sensors and the amplifying hardware/software as so good that the "noise" is not visible until much higher ISO values than just a few years ago. ISO will never be better than glass but it will always help any lens when conditions get tricky. [/QUOTE]

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