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[filmscanners] Re: Black and white scans on LS4000 EDandotherissues



Make this day on your calendar... Austin and I agree on something! ;-)

Art

Austin Franklin wrote:

> Bob,
>
>
>>Enlargers can have interchangeable diffuse light sources and
>>parallel light
>>sources. The former give soft images with less contrast, while the latter
>>give sharper images with higher contrast.
>>
>
> That's absolutely NOT true.  You do NOT get softer images with less contrast
> from a diffuse (typically called "cold") light source.
>
> There has always been a controversy about the merits of
> cold-lights.  Careful tests have proven that exactly the same tonal
> rendition can be attained with either a cold-light or a conventional
> condenser when the contrasts of the film/paper are adjusted to match.
>
> The contrast difference between condenser and diffusion sources is
> due to "Callier" effect which is scattering of light by the grains of
> the film.  The thinner the emulsion and the finer the grain, the less
> Callier effect there is.  For color film, where the image is composed
> of very small dye particles, there is practically no difference between
> them.  The diffused source will tend to show blemishes less so is
> commonly used for color printing.
>
> Personally, I believe cold light heads give better tonality for B&W chemical
> darkroom printing, having spend some 25+ years printing fine art B&W
> prints...
>
> Austin
>
>
>


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