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Photography Q&A
"Automagic" ISO setting on a DSLR
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<blockquote data-quote="taylorkh" data-source="post: 674747" data-attributes="member: 44240"><p>In the old film days I would select my film based on ISO. Perhaps 100 or 200 when I wanted detail - low graininess, 400 for general snapshot sort of pictures and a 800 or higher if I needed to shoot in low light or fast moving subjects. I set the film's ISO on the camera and usually shot in aperture priority mode. With my new D3400 I also tend towards aperture priority and allow the meter to set the shutter speed.</p><p></p><p>However, on the DSLR I observe that the ISO fluctuates wildly. 100 to 26,500! With film, the ISO represented the sensitivity of the film to light. Higher ISO, more sensitive but larger grains. This was a physical characteristic of the emulsion on the film. I am trying to understand what the ISO means on a DSLR? Obviously I am not changing the number of pixels on the sensor (I don't think). I am looking to learn and get my head around this.</p><p></p><p>And should I lock down the ISO rather than let it run wild?</p><p></p><p>TIA,</p><p></p><p>Ken</p></blockquote><p></p>
[QUOTE="taylorkh, post: 674747, member: 44240"] In the old film days I would select my film based on ISO. Perhaps 100 or 200 when I wanted detail - low graininess, 400 for general snapshot sort of pictures and a 800 or higher if I needed to shoot in low light or fast moving subjects. I set the film's ISO on the camera and usually shot in aperture priority mode. With my new D3400 I also tend towards aperture priority and allow the meter to set the shutter speed. However, on the DSLR I observe that the ISO fluctuates wildly. 100 to 26,500! With film, the ISO represented the sensitivity of the film to light. Higher ISO, more sensitive but larger grains. This was a physical characteristic of the emulsion on the film. I am trying to understand what the ISO means on a DSLR? Obviously I am not changing the number of pixels on the sensor (I don't think). I am looking to learn and get my head around this. And should I lock down the ISO rather than let it run wild? TIA, Ken [/QUOTE]
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Photography Q&A
"Automagic" ISO setting on a DSLR
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