Possible septum material

[erker@xxxxxxxxxxxxxx (Greg Erker)]

>From the cameramakers list:

>I received some fabric swatches from  Beacon Fabric and Notions
>(1-800-713-8157).  A fabric that is called Wet-look Stretch Vinyl looks
>like it might make a good bellows fabric.  Here's their description:
>"Wet-look, stetchy vinyl-coated polyester. Suitable for raincoats or
>aother waterproof garments."  I got a black sample.  It also comes in
>white and yellow.  It is shiny (wet-looking) on one side and matte-ish
>black on the other. It is very light weight and flexible.  In holding it
>over my eye and looking at the sun, I couldn't see any light.  If I
>streched it a ways, however, I could.  When I doubled it over, I
>couldn't see any light even if I stretched it.  It costs (from this
>supplier) $14.45 a linear yard (it is 54" wide).  I was thinking of
>using this fabric both for the inside and outside layer of a bellows.
>How could I tell if it is really opaque? I thought that I might wrap two
>layers around a film holder with the darkslide removed, and then let it
>in the sun for an hour or so.  If the film shows no increased density
>compared to the control  (a piece of film loaded in the other side of
>the holder with the darkslide kept in place), wouldn't it be fair to
>conclude that this would work as bellows material?  Any suggestions
>appreciated.

  Might work to separate the L&R lenses and
stretch when you focus in and out.

Greg