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[filmscanners] RE: film and scanning vs digital photography



> Seems to me the camera should be able to compensate for the vignetting.
> It "knows" the lens and the sensor, so it should know the light
> falloff.

While Digital SLRs might "know" or identify the lens focal length, aperture
setting, focus, etc., It cannot identify the glass that is used in any given
lens or the optical properties specific to that particular lens.  Since most
DSLRs allow for interchangeable lenses and lenses made by varying
manufacturers, it is probably not reasonable to expect the camera to be able
to compensate except in a generalized way for light fall off produced by any
particular lens.

> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk] On Behalf Of gary
> Sent: Thursday, July 05, 2007 2:11 PM
> To: laurie@advancenet.net
> Subject: [filmscanners] Re: film and scanning vs digital photography
>
> Seems to me the camera should be able to compensate for the vignetting.
> It "knows" the lens and the sensor, so it should know the light
> falloff.
>
> I'm not sure about the thickness of the silicon (technically the vapox
> over the sensor) being the source of the light falloff at the edges,
> but
> the effect is documented.
>
> Tony Sleep wrote:
> > On 05/07/2007 David J. Littleboy wrote:
> >> I don't buy it.
> >
> > AIUI the colour fringing is a combination of chromatic aberration in
> the
> > lens and Bayer colour interpolation.
> >
> > Vignetting is due to the microlenses presenting a smaller effective
> > aperture to off-axis rays.
> >
> > You get both together, but they're distinctly different in their
> origins.
> >
> > --
> > Regards
> >
> > Tony Sleep
> > http://tonysleep.co.uk
> >
> >
>
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