D3X vs 5D2 - myth and reality

Started Jan 26, 2009 | Discussions thread
knickerhawk Veteran Member • Posts: 6,020
Re: What is DxO's claim?

bobn2 wrote:

Another point on this. If you look at the DxO DR charts, you'll see
that the D3x, D300, D90 (at low ISO's) and A900 share this
straight-line DR curve which is characteristic of the Sony column ADC
architecture, where the read noise is really rather constant over the
ISO range (which is what causes the straight line, the only thing
changing the DR is the reduction in effective saturation, cause by
ISO amplification). By contrast, conventional ADC systems such as the
5DII and D3 have a DR curve which droops at low ISO's, since they
typically have read noise which doubles with each lower ISO step.

Interesting observation. By the way, your "Still Measurements" response to Gabor makes a lot of sense to me.
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