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Nikon DSLR Cameras
D750
Low Light ISO Setting D750
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<blockquote data-quote="TieuNgao" data-source="post: 602754" data-attributes="member: 6993"><p>Just below the "Bottom line" you quoted from that article, you'll see the graph 15a for Canon 1D3 where it clearly shows that at ISO 800-1300 the read noise is almost constant, and from ISO 1600 and beyond the read noise stays the same. That's why the next paragraph says:</p><p></p><p> "Note that the expansion on the bottom end of the range yields less and less as ISO is increased more and more -- going from ISO 100 to ISO 200 yields a big improvement at the lower end of exposure (at the cost of some latitude at the upper end); on the other hand, going from ISO 800 to 1600 doesn't make much difference at all in shadow S/N, and in addition one loses an entire stop of raw headroom. Above ISO 1600 there is no expansion of the shadow range whatsoever, just more and more lost from the top end. The ISO 3200 curve of the 1D3 isn't even plotted above, because it lies almost exactly on top of the ISO 1600 curve, apart from ending one stop earlier ot the top end. <strong>This is why it makes no sense to use absurdly high ISO's like 6400 if one uses raw capture -- it just throws away highlight headroom without getting anything back at the shadow end; it's better to underexpose by a stop or two at ISO 1600 if the shutter speed is needed, than to use higher ISO.</strong>"</p></blockquote><p></p>
[QUOTE="TieuNgao, post: 602754, member: 6993"] Just below the "Bottom line" you quoted from that article, you'll see the graph 15a for Canon 1D3 where it clearly shows that at ISO 800-1300 the read noise is almost constant, and from ISO 1600 and beyond the read noise stays the same. That's why the next paragraph says: "Note that the expansion on the bottom end of the range yields less and less as ISO is increased more and more -- going from ISO 100 to ISO 200 yields a big improvement at the lower end of exposure (at the cost of some latitude at the upper end); on the other hand, going from ISO 800 to 1600 doesn't make much difference at all in shadow S/N, and in addition one loses an entire stop of raw headroom. Above ISO 1600 there is no expansion of the shadow range whatsoever, just more and more lost from the top end. The ISO 3200 curve of the 1D3 isn't even plotted above, because it lies almost exactly on top of the ISO 1600 curve, apart from ending one stop earlier ot the top end. [B]This is why it makes no sense to use absurdly high ISO's like 6400 if one uses raw capture -- it just throws away highlight headroom without getting anything back at the shadow end; it's better to underexpose by a stop or two at ISO 1600 if the shutter speed is needed, than to use higher ISO.[/B]" [/QUOTE]
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Low Light ISO Setting D750
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