[filmscanners] RE: Newish Digital Tech

["Austin Franklin" <austin@darkroom.com>]

>...but why would a PMT
> get “more”
> > light,

> In semiconductor sensors, however, many, perhaps most, of the
> photons that hit the junction do absolutely nothing, so they're much less
> sensitive.

Hi Paul,

I’d believe that PMTs have a much lower noise floor than CCDs and that is
the reason for the much higher dynamic range, and obviously better shadow
detail.  Is that what you are talking about?

As far CCD sensitivity...CCDs have a minimum number of photons before they
can “register”, but I believe that once that level is reached, “most” of the
photons that hit the sensing area are being “counted” (accumulated)...I don’
t believe they are doing “nothing”?

Regards,

Austin



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