So they're not talking about a density range?
Frank Paris
[EMAIL PROTECTED]
http://albums.photopoint.com/j/AlbumList?u=62684
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED]
> Sent: Tuesday, January 09, 2001 2:03 AM
> To: [EMAIL PROTECTED]
> Subject: Re: filmscanners: Sprintscan 120 now on B+H web site ...
>
>
> 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
