Dynamic Range in EV has no effect on the amount of shades the K-5 can discern, it is merely defines the maximum and minimum brightness values which supply usable data at the same time. The ability to discern individual shades (or more properly differences between two shades) is solely controlled by how many bits wide the ADC system is. The K-5 can discern 2^14 shades maximum across a 14.1 EV ( a brightness range of 2^14.1) range according to the DxO tests. There is no direct correspondence between the two.
-Adam On Sun, Nov 7, 2010 at 7:40 AM, Boris Liberman <bori...@gmail.com> wrote: > Hi! > > DXOMark > (http://www.dxomark.com/index.php/en/Camera-Sensor/All-tested-sensors/Pentax/K5) > publishes that K-5 has 14.1 EV of dynamic range. My understanding thereof is > that its sensor can tell apart 2^14.1 different shades which although close > but slightly bigger than 14 bit RAW as per Pentax own specification. > > I realize that dynamic range is not the same as how many useful bits of data > per pixel RAW format contains. However, given that both are scales of powers > of two, it would seem to be interesting to consider which part of these 14 > bits (or 14 EVs) corresponds linearly to one another. > > As a side remark I think it is very odd that one is bigger than another. Few > examples to point: > > Phase One P65 Plus - 16 bit RAW, 13 EV of DR > Leica M9 - 14 bit RAW, 11.7 EV of DR > Nikon D3S - 14 bit RAW, 12 EV of DR > > What do you think? > > Thanks. > > Boris > > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
