Daaaaaaaamn! Check out the D5200 sensor!

Started Jan 24, 2013 | Discussions thread
Jack Hogan Veteran Member • Posts: 6,507
Re: Daaaaaaaamn! Check out the D5200 sensor!

Steen Bay wrote: I suggested that maybe the D5200's measured base ISO was more like ISO 96 instead of ISO 69 like DxO say (maybe just a typo?)

I doubt it, because for every camera ISO setting they actually measure the illuminance E in lux that saturates the sensor. They also actually measure the relative shutter speed in seconds, so they can calculate Exposure (Hsat) in lx-s directly and convert it to Sensitivity by Ssat = 78/Hsat. So they know this number very accurately. Since the measured/derived sensitivities double every camera ISO stop that means that going up one stop in camera ISO actually halves the Exposure required to saturate the 14 bits.

So they must be messing with the analog/digital gains that convert electrons into raw data, optimizing the performance of the sensor/ADC/system in the process.

I need to mull this over a bit longer...:-)

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cpw
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