|RedCam CentralSite Admin
Joined: 14 Dec 2006
Location: Los Angeles
|Posted: Sat Oct 17, 2009 11:14 am Post subject:
Stouffer of Mysterium-X (the forthcoming upgraded RED 4.5K sensor)... This shows about 12 stops DR (1 1/2 stops greater than the original Mysterium sensor).
According to RED's Graeme Nattress...
"This graph is from the calibrated Stouffer data on the 41 step Stouffer chart that I have here. The log intensity is calculated direct from measured raw data from the R3D, then normalized to the 0,1 range.
Shot the Stouffer wedge as normal, using Jim's Mysterium-X test camera. Used the 18-50 zoom, F8. I took the R3D and read out the raw values for each of the 41 wedges. I can view a "corrected" image while reading out the raw values, and the black surround which holds the Stouffer on the backlight was actually very slightly darker than wedge 41, the darkest wedge. This difference although visible with an extreme image development it doesn't actually show up in the above plot.
So although the shadow tail of the graph looks flat, there's in reality a very small gradient there that does show the minutest of detail in that shadow.
Similarly, at the top, you can see a small slope before the data clips.
And to add, the Stouffer wedge is calibrated, so when the graph is plotted I use the calibration optical density rather than a strict 1 wedge = 1/3 stop.
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