DXOMark just tested the D3X

Started Jan 15, 2009 | Discussions thread
Toermalijn Forum Pro • Posts: 15,808
Re: DR is in EV and Tonal Range is in bits (log base 2)

sidelight wrote:

Zane Paxton wrote:

Bernie Ess wrote:

They say the D3x has 13,7stops of DR,

Hi Bernie,

Their description uses the term "Bits" not "Stops". I couldn't find
any definition on their site that defines or describes what they are
doing as far as units..... There are only 10 zones and maybe 7 of
those are actually useful... 13 stops is absurd... They do use
something called "Tonal Range" which is different from their DR
measurements and is indeed defined in f/stops.

Actually, Dynamic Range is given in EV units which are the same as
stops. Same as Zones in Zone System. The Tonal Range units are bits
on a log scale. Each bit represents a doubling of gray levels. So
10 bits would be 2^10 or 1024 gray levels. I believe that Dynamic
Range is theoretically infinite as brightness can continue to
increase, not that we can see it or record it all. So, DxOMark is
saying the D3X has 13.7 stops normalized to an 8MP 8x12 print (does
this for all cameras using the Print view on the DR Tab). I would
say you are probably right in that it might be hard to see all of
these. But supposedly the info is there.

What it means it has nice graditions of colours...better portrayal of subtle colours, skin tones etc. The numbers back up what you see in the examples or prints, fine detail with lovely colours! The more graditions levels you have, the more subtle colours you could portrayal.

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