So what you are saying is that the dynamic range is the number of bits
in the Analogue Digital Converter, and has very little to do with the dynamic
range of the CCD? Wouldn't it be nice with a signal to noice ration instead,
like -50 dB?
Regards
Erik
On Tuesday 09 January 2001 11:02, you wrote:
> In a message dated 1/8/2001 11:55:37 PM EST, [EMAIL PROTECTED] writes:
> > The 3.9 dynamic range sounds unbelievable. I wonder how they achieve
> > that?
>
> 3.9 just means 13 bits of dynamic range. They're using a 14-bit A/D
> converter, which most vendors convert to a dynamic range of 4.2.
> I suspect Polaroid is just being conservative.
>
> Note that the Nikon 4000 ED and 8000 ED (I love these names <smile>)
> have a 14-bit A/D converter, and Nikon says the dynamic range is 4.2.
> The CoolScan IV ED has a 12-bit A/D converter, and Nikon says the
> dynamic range is 3.6 (log10(2^12) = 3.6).
>
> In summary, dynamic range is just another way of saying how
> many bits the A/D converter uses:
>
> 10 bits = 3.0
> 12 bits = 3.6
> 14 bits = 4.2
>
> Regards,
> Ed Hamrick
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