Ну дык народ до сих пор недоумевает по поводу 22битового анализа в новом Пентаксе. И некоторые считают, что чем больше битов, тем больше ДД у камеры. Что, понятно, чепуха.
Далее по той же ветке на ДПРевью:
> For this crucial process, the K10D incorporates a 22-bit converter
> that can generate an astonishing 4.2 million gradations — the
> highest of all existing digital cameras. Compared with conventional
> 12-bit converters (with 4,096 gradations), this high-performance
> converter can process 1,024 times more image data, assuring greater
> dynamic and graduation ranges. As a result, the K10D reproduces all
> elements of your images — from delicate skin tones to subtle
> differences in material and texture — more faithfully and
> brilliantly than ever before. Now, with the K10D, you can explore
> the fascinating world of digital SLR photography with greater
> freedom and energy than ever before....."
> If you notice they are talking about better DR.
And if you notice, they're making a claim they can't back up. How exactly do you get 4.2 million gradations out of integer values between 0 and 65536? I can't do it, and neither can they.
The only reason I can see to use a 22-bit ADC is that you can get a slightly non-linear 22-bit ADC cheaper than a perfectly linear 16-bit ADC. By using the most linear of the 22 bits you could get a cheaper ADC and a marketing benefit! Woohoo! Engineers and marketeers are both happy. (Actually, I can think of another reason to use 22 bits, but it doesn't apply to this discussion, so I'll leave it off.)"