Re: Digicam

["dickbo" <dickbo@xxxxxxxxxxxxxxx>]

Actually you can settle the whole issue by simply asking yourself this
rather fundamental question "Do I like what I see?" or perhaps in your own
particular case it might read "does the client like what he sees?"

To which I might add "...and will he pay for it"  (:-)


----- Original Message -----
From: "SKID Photography" <skid@bway.net>
To: <scan@leben.com>
Sent: Sunday, June 09, 2002 5:21 PM
Subject: Re: Digicam


> Kennedy,
> But now we are getting into that whole theoretical detail from lenses and
film vs.
> the information contained in the grain, and the fact that the grain is
both random
> (fractal) in arrangement and form whereas pixel arrangements are in a
grid.  So to
> reproduce (in a scan) that random information, it takes a lot of
rectangular
> pixels.
>
> Harvey Ferdschneider
> partner, SKID Photography, NYC
>
> > In article <3D02C440.ADAE8B1E@bway.net>, SKID Photography
> > <skid@bway.net> writes
> > >"Paul D. DeRocco" wrote:
> > >
> > >> Even with Kodachrome 25, a tripod, and a fixed focal length lens, I
don't
> > >> believe there's ever 8000dpi worth of actual picture information on a
piece
> > >> of film.
> > >>
> > >
> > >Paul,
> > >Then you would be wrong.  There is well over 40,000 dpi in a piece of
35 mm
> > >film.   This has been discussed ad nauseum on several other lists and
that has
> > >been the conclusion, every time.   I don't wish to repeat it here.
> > >
> > Harvey,
> >         whilst there may well be over 40,000dpi of information present
> > on a frame of high resolution 35mm film, there certainly is not ever
> > anything close to that in actual image information, which is what Paul
> > was referring to.
> >
> > I suggest you take a look at some Kodak MTF curves for their colour
> > films which generally show an MTF down to 10-15% at 120cy/mm maximum,
> > falling at an order of magnitude every 10cy/mm or so.
> >
> > (E100S is at:
> >
http://www.kodak.com/global/en/professional/support/techPubs/e164/f002_02
> > 17ac.gif )
> >
> > Kodachrome 25 was down to 10% MTF at 100cy/mm, E100S is 10% at only
> > 70cy/mm.  A Fuji Provia 100F data sheet specifies the resolution at
> > 1000:1 contrast (ie. much more than the typical fine detail in an image)
> > of 140l/mm (probably meaning 140cy/mm, though) and only 60l/mm for a
> > more typical 6:1 contrast object.
> >
> > Similarly, even a perfect f/8 lens has an MTF of only 50% at 100cy/mm
> > and 10% at 200cy/mm, falling to zero at 250cy/mm (green light).
> >
> > Even assuming the best development, a high contrast object, the finest
> > optical system possible and absolutely no camera motion during the
> > exposure, the best we can realistically expect on the film is around
> > 150cy/mm for the finest visually detectable detail.  Given the Nyquist
> > sampling requirement of two pixels per cycle, this is 300pixels per
> > millimeter, or approximately 7500dpi - at which level the detail will be
> > no greater than the noise floor on even the best theoretical scanner!
> >
> > Yes, there may well be detail on film at 40kdpi, but it certainly ISN'T
> > image detail!
> > --
> > Kennedy
> > Yes, Socrates himself is particularly missed;
> > A lovely little thinker, but a bugger when he's pissed.
> > Python Philosophers
> > -
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>
>
>
>
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