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Nikon DSLR Cameras
D500
ISO Lo1 setting
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<blockquote data-quote="WayneF" data-source="post: 634880" data-attributes="member: 12496"><p>The DR is less though, however it might still be generally adequate.</p><p></p><p>The camera sensor has one ISO sensitivity, often ISO 100 in most models. That is how much light (photons) is collected in the sensor cells.</p><p></p><p> Then higher ISO multiplies these values to shift the histogram right, up brighter. That also boosts the low level noise higher too, to be seen much better. This part is easy to understand.</p><p></p><p>The lower ISO method divides the sensor values, shifts the histogram left, down. That shifts noise off of the low end reducing noise (what there was of it at ISO 100 native). This shift down leaves blank empty space at the top of histogram, which is reduced DR, not utilizing all of the space that could be possible. Contrast and DR are similar but inverse things (the difference in bright and dark values). Contrast is higher due to reduced highlights. This simply does not meet the specifications for ISO, and Nikon does not call it ISO (instead calls it LO 1, etc).</p><p></p><p>The histogram data is shifted for LO and HI (or any ISO higher than 100), but this exception does not show, nor cause clipping. Before it is stored, the histogram shown to us is also adjusted to "hide" the shift, it looks normal to us. But it has been manipulated.</p><p></p><p>The D500 manual page 124 says LO 0.3 - LO 1 is "equivalent" to ISO 80 - 50 (speaking of sensitivities), but says contrast is higher than normal, and clearly says ISO 100 or higher is recommended.</p><p></p><p>Doesn't mean it won't work for your use though.</p></blockquote><p></p>
[QUOTE="WayneF, post: 634880, member: 12496"] The DR is less though, however it might still be generally adequate. The camera sensor has one ISO sensitivity, often ISO 100 in most models. That is how much light (photons) is collected in the sensor cells. Then higher ISO multiplies these values to shift the histogram right, up brighter. That also boosts the low level noise higher too, to be seen much better. This part is easy to understand. The lower ISO method divides the sensor values, shifts the histogram left, down. That shifts noise off of the low end reducing noise (what there was of it at ISO 100 native). This shift down leaves blank empty space at the top of histogram, which is reduced DR, not utilizing all of the space that could be possible. Contrast and DR are similar but inverse things (the difference in bright and dark values). Contrast is higher due to reduced highlights. This simply does not meet the specifications for ISO, and Nikon does not call it ISO (instead calls it LO 1, etc). The histogram data is shifted for LO and HI (or any ISO higher than 100), but this exception does not show, nor cause clipping. Before it is stored, the histogram shown to us is also adjusted to "hide" the shift, it looks normal to us. But it has been manipulated. The D500 manual page 124 says LO 0.3 - LO 1 is "equivalent" to ISO 80 - 50 (speaking of sensitivities), but says contrast is higher than normal, and clearly says ISO 100 or higher is recommended. Doesn't mean it won't work for your use though. [/QUOTE]
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Nikon DSLR Cameras
D500
ISO Lo1 setting
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