How
do I purchase a random dot screen for double exposures?
The
dot screens mentioned in my book (on page 58) are Cristal Raster
screens, printed on an imagesetter, either at 1800 or 2400 dpi,
80% black, and 21um (dot size). They are pretty cheap if you get
them straight from a film printing bureau. A film lab has to have
the Cristal Raster software. The lab I use has Agfa Cristal Raster
software. You have to ring around to find somewhere that has that
facility. I pay about Aud$20 for an A4 size screen (21 x 30 cm)
and Aud $30 for an A3 (30 x 42 cm). The screens are good and long-lasting,
but need to be kept flat or rolled, and not creased.