Samsung NX200 Manual Book page 23

023
Chapter 2. Performance
Realizing ISO 12,800
of high sensitivity
The revolutionary performance of the NX200's Driem Ⅲ DSP chip allows
users to increase the ISO sensitivity up to 12,800, making it possible to
shoot in low light indoors or even at a roadside with lighting at night without
the use of a strobe. Increased ISO sensitivity generally results in increased
noise, and requires users to use the sensitivity at only 2 levels below
the ISO sensitivity that preset in the camera. With the NX200 sensitivity
up to ISO3200, users can take real-life shots in any circumstances and
environments.
With other manufacturers' cameras, the ISO level can only be moved by 1
step, but in the NX200 the ISO level is adjusted by 1/3 of a step (100 
125  160  200  250  320  400). As a result, you can use a very
specific, but still high ISO setting with low noise.
With the NX200, Samsung has optimized the design of the camera to
create a wide receiver area, using copper (Cu) rather than Aluminum
(Al) in the receiver. The NX200 design allows more light to enter the
sensor. On top of this, the transmittance of the micro lens and the overall
sensitivity of the device have been further adjusted with the 20.3M sensor
to improve the other optical properties, increasing pixels and reducing
noise to provide up to ISO12,800.