BSI Sensor + ISO 64
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BSI Sensor + ISO 64

The D850 (shown here with the optional MB-D18 grip attached) is Nikon's first full-frame camera to utilize a backside-illuminated sensor. This design tends to result in greater efficiency because there's no circuitry taking up space in front of the pixels. This should boost performance in low light situations where you might employ high ISOs.

On top of that, BSI has the effect of bringing the light-sensitive elements of the chip closer to the surface, which should improve the ability of pixels near the edge of the sensor to accept light rays approaching at oblique angles, when shooting with wide-angle lenses.

Plus the D850, like its predecessor, still offers a base ISO of 64, which should give a high level of dynamic range (bordering on medium format) when working in bright or high contrast situations. On the other end of the spectrum, its new top native ISO is 25,600, expandable to 102,400.