Re: Pre-orders open! Sony A7R III and FE 24-105mm f/4 OSS lens!
elimoss wrote:
My electrical engineering days are long behind me but I get really confused about how we could have 15 stops DR in a 14 bit space if the values are recorded linearly. You can only have 0 to 2^14 - 1. Maybe there is a curve or something else applied and it's not linear the way I think it is.
Executive summary:
1) Individual values are integral but multiple values are sampled to get the standard deviation so it's an error to think of the values as integral; they are decimal.
2) So hypothetically dynamic range could be infinite except that Quantization Error makes it impossible to actually measure the read noise below a certain level.
3) Although theoretically quantization error is limited to 1/sqrt(12), about 0.29DN, in practice (because of fluctuation bias values) things break down at about 0.6 to 0.7 DN (seen in practice and simulated)
4) Therefore, in practice, you get about n+0.5 stops maximum dynamic range out of an n-bit Analog to Digital Converter (ADC).
Oct 27, 2017 at 02:04 PM
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