P3D Re: Projection problem

["Greg Wageman" <gjw@xxxxxxxxxx>]

From: Tom Hubin <thubin@xxxxxxxxx>


>Greg Wageman wrote:
>
>> the emulsion side faces away from the viewer's eyes both in
>> projection and in hand viewing.  (The slide is simply rotated 180
>> degrees to invert it for projection.)  This gives the correct
right-left
>> orientation, as originally photographed, in both presentation
methods.


That's what I get for responding to e-mail while doing three other
things (including scanning stereo slides)...the above doesn't really
clarify much, does it.

What I meant to say was that the emulsion side faces the lens/screen
when projecting.  The non-emulsion side faces the lens when viewing in a
conventional hand viewer (i.e. one without mirrors or prisms).

>I have projected mono 2x2's and they were inverted with the emulsion
>side toward the screen. At least I am pretty sure that is what I did.


That would be correct.

The way I was thinking about it, which resulted in the ambiguous
paragraph quoted above, is that you can take a correctly-oriented slide
out of a hand viewer, rotate it 180 degrees around the axis
perpendicular to the film plane, drop it into a projector and have it be
in the correct orientation for projection.  That's where the "emulsion
faces away from you" confusion came from; it faces away from you as you
load the slide into the tray, viewed from the lamp side.  But it faces
the lens for projecting, and away from the lens when viewing.

     -Greg W. (gjw@xxxxxxxxxx)