E-M5 has DR 13!

Started Apr 13, 2012 | Discussions thread
Detail Man
Detail Man Forum Pro • Posts: 16,789
Re: DR and bit depth are not related

J R R S wrote:

Absolutly correct - the bit depth has no effect on the DR... you could build a sensor to have very low DR and still have 12 bit of decernable output... it would pickup very subtle diffrences in tone/shade. (maybe usefull for analizing atmousphere tone/shade very accuratly to deturming composition).

Photo-sensors are analog (linear, continuously variable output) opto-electronic transducers. If it is not capable of transducing low levels of light, then it would not be worth much for photography.

Like wize you could make a camera for looking at the sun with an incredible DR and just an 8bit output or 4bit... it would be able to capture and resolve the dark and light bits and eveything inbetween but will just have very poor tone and shade distinction (posterized look to output).

The Dynamic Range is the ratio between the highest and the lowest possible output (digital) data. The maximum bit-depth at system output defines the maximum possible output Dynamic Range over which data can be represented. The ratio between the highest and the lowest magnitude data values that can be represented is defined by the numerical Base (B) to the exponent (N). Using a binary number system (base 2), that Dynamic Range equals 2^N of representable values.

DR and bit depth are not related....

Only in a system where there exists no need to represent data that exists at low levels, my friend !

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