15Bit wrote:
I\'m curious - how will reducing the fab process size improve DR?
I think we can take it as read that a smaller fab process will enable greater pixel density, but DR is a function of the noise floor and the efficiency of the sensels to collect photons. How does a smaller process size improve this?
Well Sony uses a 0.18micron fab process. This means the line traces for the back-side circuitry is much smaller. Sony has managed to keep the entire readout, ADC-pipeline, NR etc on chip. Canon has to do a lot of this off chip and Sony\'s entire pipeline after the initial ADC is digital. The very short pipeline means less chance for noise to be introduced. The Sony has low ISO DR advantage due to the fact it\'s read noise is about 10x less than Canons\' comparing D800 and 5D III. DR is the maximum signal divided by the noise floor in a pixel at each ISO and at low ISO the Canon noise floor is much higher. At higher ISO the read noise improves quickly for Canon and this is why at about ISO 800 or so the DR of the 5D III is similar to D800 and pulls ahead at higher ISOs.
Sep 16, 2014 at 01:07 AM
Previous versions of Pixel Perfect's message #12580410 « So is there a new sensor in 7D Mark II? »
