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D90 Photographic Dynamic Range - Surprising Result

bclaff

Vancouver (WA USA not BC Canad, US
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bclaff Awarded for multiple contributions for the Resources Registered since 26th Oct 2004
Mon 20-Oct-08 10:22 PM

Photographic Dynamic Range Defined

Photographic dynamic range is a practical measure of the ability of the sensor to capture an image that will have acceptable noise at a normal enlargement and viewing distance.

This is distinctly different from dynamic range as defined in engineering terms.

How Photographic Dynamic Range is Determined

The raw data from a series of dark images is analyzed for Signal to Noise Ratio (SNR).

The SNR values are adjusted for the Circle of Confusion (CoC) that is appropriate for the sensor size.

The signal value at which this corrected SNR crosses the value of 20 is used to compute a Dynamic Range (DR) value as an Exposure Value (EV).

Results

The following updated results include data for the D90.

The initial results were surprising so I acquired two additional datasets that confirm the findings.

Click on image to view larger version


The D90 has better Photographic Dynamic Range than the D300 at every ISO.
And the Photographic Dynamic Range even exceeds the D3 and D700 at ISO 100 (but not above ISO 200).


Bill
Attachment#1 (jpg file)

Visit me at Photons To Photos

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