"C.H.Ling" wrote:
>
> ----- Original Message -----
> From: "John Hudson" <xyyc@xxxxxxxx>
>
> > "C.H.Ling" wrote:
> > >
> > > I can't agree with the use of ND filter will reduce contrast, ND
> > > filters should reduce brightness of scene proportionally,
> >
> > Not so I think. All an ND filter does is to slow the rate at which the
> > available light passes through the lens system from the outside world
> > onto the film in the camera. The quality of the light per se is
> > preserved. The use of an ND filter prompts the use of a slower shutter
> > speed and / or a larger aperture.
> >
> > jh
> >
>
> ??? Was I saying the same thing?
No! The ND filter does not reduce the brightness of the scene. The
brightness of the scene is a consequence of the light falling upon the
scene. In the daytime you would have to regulate the brightness of the
sun and / or whatever came between the sun and the scene to affect the
brightness of the scene.
John Hudson
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