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Message: <blockquote data-quote="DW_" data-source="post: 47161" data-attributes="member: 8667"><p>I love the internet and the bulk of the people who make it what it is today. I wrote Bill Cliff and asked some questions about his charts and the subject of native ISO, below is his reply.----</p><p></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Dave,</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">The ISO listed on the Sensor Characteristics Chart is confusing and I have been meaning to change how that is reported. </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">That value has more to do with metering and is used to help compute Quantum Efficiency (provide Gain is also known). </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">The ISO@6.5 value is the highest ISO that you can use and still achieve a PDR of at least 6.5</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">This is a little like DxOMark "Sports ISO"</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">PDR stands for "Photographic Dynamic Range"'</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">You can read about it at my site. </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">A good place to start is here:</span></span></p><p></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><a href="http://wlmailhtml:{E0654D2B-8293-4370-A1BC-B51E4A850B7E}mid://00000084/!x-usc:http://home.comcast.net/~NikonD70/GeneralTopics/Sensors_&_Raw/Sensor_Analysis_Primer/Engineering_and_Photographic_Dynamic_Range.htm" target="_blank">http://home.comcast.net/~NikonD70/GeneralTopics/Sensors_&_Raw/Sensor_Analysis_Primer/Engineering_and_Photographic_Dynamic_Range.htm</a></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">PDR is quite similar to DxOMark "Landscape Dynamic Range" </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">As for "native" ISO, I define that as the highest ISO that corresponds to the lowest gain (or read noise) for the sensor.</span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">In the case of the D7000 it is ISO 100. </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">It's not always the lowest numbered ISO.</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">For example is is ISO 160 for the D300</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><a href="http://home.comcast.net/~NikonD70/Charts/RN_ADU.htm#D300_14,D7000_14" target="_blank">Read Noise in ADUs versus ISO</a></span></span><span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Regards,</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Bill</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">P.S. - You might find playing with the interactive charts interesting.</span></span></p></blockquote><p></p>

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