Canon Rumors said:
<p>Nikon New Zealand outed the imminent Nikon D5 body before they were supposed to on their Facebook page. Nikon Rumors captured a screenshot before it disappeared.</p>
<p>I’d say this is a strange announcement for CES, but I guess consumers buy D5’s.</p>
<p><a href="http://www.canonrumors.com/wp-content/uploads/2016/01/Nikon-D5-camera-announced.jpg" rel="attachment wp-att-24178"><img class="alignnone size-medium wp-image-24178" src="http://www.canonrumors.com/wp-content/uploads/2016/01/Nikon-D5-camera-announced-398x575.jpg" alt="Nikon-D5-camera-announced" width="398" height="575" srcset="http://www.canonrumors.com/wp-content/uploads/2016/01/Nikon-D5-camera-announced-398x575.jpg 398w, http://www.canonrumors.com/wp-content/uploads/2016/01/Nikon-D5-camera-announced.jpg 498w" sizes="(max-width: 398px) 100vw, 398px" /></a></p>
<p>Your move Canon….. it’s coming soon
</p>
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All Nicon is saying is that they consider it to be the best Nicon camera. ISO is in effect a binary multiplier. There is no such a thing as a "standard" - there only is a maximum usable multiplier. The maximum usable multiplier is governed by the bit-depth of the AD converter together with the quiescent noise floor in relation to the voltage level that represenst the complete absence of light.
The best image for representing how ISO works is a 30cm ruler placed on top of a printed scale that ranges from 0 Volts to maximum Volts.
0cm is a fixed pivot point around which the ruler can describe an arc.
30cm is the measuring point at which the printed scale can be read off.
Along the centre of the ruler is a slot cut into it in which can slide a lever that represents the actual analog voltage and can only move up or down, and thereby causes the ruler to pivot around its fixed point.
When the leaver is at the 30cm point the voyage read off is identical to the actual voltage.
When the leaver is closer to the 0cm point a comparatively small movement of the leaver causes the 30cm point to move further than it would have if the leaver was at the 30cm point.
100 ISO can be considered to be the same as having the leaver at the 30cm point - a 1:1 ratio.
200 ISO can be considered to be where the leaver is positioned at the point where the 30cm point moves 2 times the distance the leaver moved
400 ISO is likewise positioning the leaver so that the 30cm point moves double the distance it moved for the ISO 200 leaver.
Eventually the leaver gets closer and closer to the 0cm point on the ruler, and a smaller and smaller movement of the lever causes larger and larger movement of the 30cm point, until almost no movement at all causes maximum movement of the 30cm reading point.
The scale printed scale is used for setting the position of the leaver and for reading the voltage from the 30cm point.
The issue becomes quantization noise when setting the leaver to represent the actual voltage, and reading the 30cm voltage to the closest mark on the scale.
That quantization noise is due to the gaps between marks on the scale at each end.
The higher the ISO the smaller that leaver has to move to represent complete dark and maximum brightness, but the marks on the scale remain the same whether it be ISO 100 or ISO 8000.
At the most extreme ISO the voltage change is so tiny, and the gaps in the scale so competitively large that a miniscule change in voltage can cause large imperfectly maoped changes in the read-out voltage.
To summarize, the fineness of the scale - the smallness of the gaps between the points on the scale means a more accurate read-out of tiny voltage changes, and the longer the gap on the ruler between the leaver and the read-out point means the greater the dynamic range.
Thus the nervana of maximum DR and maximum ISO eventually becomes how much should the difference between 1 photon and 2 photons be represented at the read out point.
