[filmscanners] RE: HP PhotsSmart - questions

["Laurie Solomon" <laurie@advancenet.net>]

First, I apologize for taking so long to respond; and second, for some
terminological misuse on my part.

I probably should have used "Front" and "Rear" surfaces of the lens element
rather than "inside" and "outside" surface.

What I was trying to say was that the better lens makers may be putting
their coatings on the rear surface of the lens rather than the front
surface.  Since the rear surface of a lens element is protected from user
abuse and cleaning abuse by the user, it is less likely to be effected by
harsh chemical solutions that are used on the front surface.  Even if the
rear surface of the lens element is facing the front surface of another lens
element so as to sandwich the coating between the two lens elements, there
usually is not a vacuum inside the lens and between the lens elements so the
internal rear surface of a lens element will still interface with air that
exists between he lens elements.

> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk] On Behalf Of
> wbgilloolyjr@charter.net
> Sent: Monday, August 08, 2005 2:42 PM
> To: laurie@advancenet.net
> Subject: [filmscanners] Re: HP PhotsSmart - questions
>
> Lens coatings MUST be on the outside surface of the lens or
> else they don't work.  Pretty much, they would be on every
> glass-air interface.
>
> Mr. Bill
>
> Laurie Solomon wrote:
> > Without trying to question or second guess the Schneider guy, I
> > suspect that the reason for the recommendation without reservations
> > was because he was referring to Schneider lenses and they
> unlike some
> > of the cheaper prosumer lenses may not put their
> multicoatings on the
> > outside surface of the lens or lens elements where they can
> get scratched...
>
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