Re: [Leica] Projection screen criteria for slides made with a Leica

[Andre Jean Quintal <quia250249@yahoo.com>]

At 19:44 +0000 01/11/98, Dr James Harper wrote:
[ . . . ]
>Assuming that paint is used:
>
>	a]  What version of white should it be?  Modern paint catalogues show
>forms of 	white ranging from snow to dairy cream.  This is not meant
>to be
>a silly 	question.  Some screens are in silver after all.
>
>	b]  What finish works best?  I personally find screens with a beaded
>finish too 	bright  for those sitting in the centre, and too dim for those
>at the sides. So 	perhaps a matt finish?

	A very good source of information is the Markertek catalog
	for audio / video / AV people, available from their website.
	Their national phone number is: 1-800-522-2025,
	fax: 914-246-1757

	My dream solution is the following
	and the very moment i own a home,
	it's a "next day" affair:

	a ceiling integrated, remote controlled, "drop down"
	screen, as big as the place will allow. . . 96 "  x 96 "
	nominally where i'm concerned. It appears seamless screens
	are quite readily available to 25' wide and beyond,
	so "blow-up" projection is no problem.

	In the 1996 Markertek catalog, they write:

	MATTE WHITE: for general purpose viewing :
		The matte white is the most popular
	screen surface and also the most flexible for front screen
	projection. The non-glass screen gives precise definition
	of color as well as black and white. It provides the widest
	viewing angle without loss of resolution. Excellent for
	close viewing distances. Surface is washable with mild soap
	and water. Flame retardant and mildew resistant.
	Designed especially where room lighting is controllable.

	GLASS BEADED for projectors with poor light output :
		Made of optical quality glass beads
	applied to the backing to form a continuous optical quality
	screen surface. Glass bead offers a surface about 3 times
	brighter than that of the Matte White type. Designed
	for low light output projectors or long and narrow rooms.
	Viewing is possible withinn 30 degrees of the projection axis
	or a seating cone of 60 degrees. Screens are mildew
	resistant and flame retardant.

	SILVER LENTICULAR for high reflectivity :
		The silver lenticular screen is especially designed
	for situations where the projection room can't be completely
	dark. It is a seamless screen with a high gain surface that
	requires tension. This screen type is not recommended
	for overhead projection. It works best for slides and video.
	It is also recommended in drastic viewing angle situations.
	Surface is washable with mild soap and water.

	SILVER SUEDE for video viewing :
		The video spectra screen is ideally suited for video,
	data and graphic display. It is more commonly used with LCD
	video projection equipment. Provides an optimal viewing angle
	with a special pearlescent coated surface. Surface is easily
	cleaned with mild soap and water. Flame retardant and mildew
	resistant.

	If you still want to go with paint, it's very likely you'll
	have a slight color rendition problem of the order of CC 05 / 10
	Yellow or Blue. Considering all the money you've already put
	in such a high quality photo system as Leica brand and property
	ownership, i'd try to convince you to get a screen recessed
	in your ceiling that could double as LCD TV projection screen,
	as these have come down in price in the last year or so.

	The main argument in favor of such a screen certainly
	would revolve about the luminosity of the image (brightness
	range) .

	Hope the above is useful.

	Andre Jean Quintal