Re: Transparent cardboard reference

[erker@xxxxxxxxxxxxxx (Greg Erker)]

>This must be pretty thin cardboard to pass
>light. I'm considering laminating some black
>craft paper to the front of the mounts. Don't
>know if it will help and will be a bit of work
>but it should be easy to trim with an exacto
>knife.

  They aren't that thin but light does
come through them.

  For example you have a photo with a
large dark background. It has one very
bright area at the top which you crop out
with a landscape 645 mount.

  In my viewer the light coming through
the bright spot will come though the
mount and be distracting.

---

  I've sometimes cropped to 40x40 by
using a portrait mount for the front
and a landscape mount for the rear.

  In this case you only have one
cardboard thickness at each edge (for 5 mm)
so the light really comes through.
So what I do is blacken the inside
of each mount half with a felt marker.
Works fine.

  I'm too lazy to do this in normal
mounting. So I test view the slide
before closing it up and then apply
silver tape where needed to block
light. Some times I might use 6 or more
inches inside one mount before I'm
happy with the light leakage.

  On a normal brightness 6x6 shot
I might use about 2" of tape, just
to hold the film chips.


>This reminds me, ever taken any stereo pics.
>of the moon? I understand one shot at moonrise
>and one near moonset will give you a base separation
>determined by the earth's rotation and your
>latitude.

  Not me. It's only 1/2 degree wide
so you need about 3000mm lens (on 35
mm film) to fill the frame.

  I also recall some discussion on
photo 3d of why this doesn't work.
Though the 8000 in 250,000 would seem
to be okay.

Greg