Jan Steinman wrote:
>
> >Are you sure? seems that I have seen the video cam quote much more than 34db
> >SN ratio, they are better than slide?
>
> Interesting. They may be playing specmanship. Or they may be expressing a
> voltage ratio.
>
> Or they could really be doing an honest 34db, which would be about 10 stops,
> I think.
>
Ok, I agree with you about 34 or 40db if you interpret it by power
ratio, but one just used to the linear ratio like using on audio,
sound output is also power but people use linear ratio like the S/N
ratio of tape recorder or power amplifier.
> > > Good drum scanners can see a Drange of 4.0, but in my experience, Velvia
> >doesn't stretch nearly that far. On my ColorGetter Falcon, 4"x5" RVP
> >(Velvia) seems to run from 0.16 to 3.4 or so.
> >
> >Really? I just think Velvia provided the deepest color of all slides, if 3.4
> >is good enough then why people make the dmax 4.0 scanner?
>
> Specmanship? :-)
>
> I have not scanned ANY film that would approach the full range of my drum.
> The only way to read the whole range is a piece of black tape measured
> against the bare drum, which shows up as 0.0 to 4.0. Even horribly
> over-exposed film base measures about 0.16, and totally unexposed film
> covered by the film holder reads about 3.6 - 3.8 or so.
>
> --
May be you are right if you have really technically measure the
density of a film. But the personal film scanner today may not be poor
than your old design drum. Actually I was wrong about the quote of
LS4000, Nikon claim a D-range of 4.2 not 4.0. I think a total dark is
much more than 4.0 otherwise Nikon (and probable Polaroid SS120, 4.2
D-Max) are making joke about their D-range.
C.H.Ling
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