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<blockquote data-quote="BackdoorArts" data-source="post: 270863" data-attributes="member: 9240">The concept that you're asking about is &quot;Native ISO&quot;.&nbsp; It is the ISO setting (or range of settings) where no amplification of the analog signal coming from the sensor is required (n the D7000 Native ISO is 100).&nbsp; So anything above that requires the camera to boost (amplify) the signal before interpreting the image.&nbsp; Noise is a result of amplification, and the higher the level of amplification the more potential for noise there is.&nbsp; As a guitar player, an easy example of this would be plugging a guitar into a tube amp.&nbsp; At very low volumes (i.e. low amplification) you get a very pure, clean sound - just as you get very little noise at ISO levels slightly higher than Native ISO.&nbsp; As you turn the amp up, at some point you start to hear the sound distort.&nbsp; Every amp is different (like every camera) with some breaking up at 5 and others being able to hold a fairly clean tone all the way to 10 (or even 11!!).&nbsp; The D7000, as others have said, seems to hold up until around ISO 1600.&nbsp; Anything above that is almost unusable for me unless there are very few details.&nbsp; For birds in flight where I might be cropping I found that ISO 800-1000 is about as high as I'd want to go.&nbsp; So you could say it breaks up around 5 and distorts at 6-7.&nbsp; My D600 lets me crank it to 11, giving me no issues all through it's ISO range (50-6400, native ISO 100), and even when I throw the boost pedal on I can get away with 12800 (ISO 25600 is even usable when some noise isn't an issue).</blockquote>

[QUOTE="BackdoorArts, post: 270863, member: 9240"] The concept that you're asking about is "Native ISO". It is the ISO setting (or range of settings) where no amplification of the analog signal coming from the sensor is required (n the D7000 Native ISO is 100). So anything above that requires the camera to boost (amplify) the signal before interpreting the image. Noise is a result of amplification, and the higher the level of amplification the more potential for noise there is. As a guitar player, an easy example of this would be plugging a guitar into a tube amp. At very low volumes (i.e. low amplification) you get a very pure, clean sound - just as you get very little noise at ISO levels slightly higher than Native ISO. As you turn the amp up, at some point you start to hear the sound distort. Every amp is different (like every camera) with some breaking up at 5 and others being able to hold a fairly clean tone all the way to 10 (or even 11!!). The D7000, as others have said, seems to hold up until around ISO 1600. Anything above that is almost unusable for me unless there are very few details. For birds in flight where I might be cropping I found that ISO 800-1000 is about as high as I'd want to go. So you could say it breaks up around 5 and distorts at 6-7. My D600 lets me crank it to 11, giving me no issues all through it's ISO range (50-6400, native ISO 100), and even when I throw the boost pedal on I can get away with 12800 (ISO 25600 is even usable when some noise isn't an issue). [/QUOTE]

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