> Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>
> The energy absorbed in the outer layer is efficiently transferred to the
>
> dye at the surface of the silver halide. This enhanced light absorption
> increases the photographic sensitivity of the crystals, resulting in
> improved overall imaging efficiency in PORTRA 400- and 800-speed Films.
> ------------------------------------------------------
>
> So I ask, if the photographic sensitivity has been increased, why are
> they still ISO 400 and 800 emulsions?
>
It may mean they can get by with less silver in the emulsion and still retain
the rated ISO.
...Wayne
Wayne Harridge
http://lrh.structuregraphs.com
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|