Digital BW, The Print

Hi Martin,

> With the drum scanners where in the light path are the color
> filters? Are they between the PMT and the film or between the
> light sources
> and the film?

Light path of a drum scanner:

light source -> mirror -> drum -> film -> lense -> splitter -> filter(s) ->
PMT(s)

> If the latter case, I would assume there is a theoretical
> advantage in resolution to using a single color light source.

Single color light source, typically a halogen or something very bright and
focused.

> If
> filtration
> is after the light passes through the film than all three
> channels would be
> equal.

The filters will make them not equal though...  What do you mean by "equal",
and why is that important?

Austin