Nice Projection Screen

[planters]

I am preparing a large " barn" for a Halloween party and the far wall needed to be covered with a projection screen ( windows, shelves etc. ). I tried a number of materials to cover the 6M high x 12M wide surface and came upon Diamond Foil. This stuff is neat. It is a scrim reinforced 6.7mil polyethylene plastic film which is mat-aluminized on one side and bright white on the other. It comes in 4 foot wide rolls up to 100 foot long. The aluminized side is interesting, but not that useful. It is absolutely non-specular, but highly directional and if not perfectly flat produces an image with varying brightness. The other side is a very good projection screen with a bright, wide, homogeneous viewing angle and no bleed ( it remains quite dark between projected lines). Its waterproof and cheap at $0.20 US/square foot delivered within the US. Diamond foil is used extensively in the agricultural area and I purchased mine from High Tech Garden Supply out of Cranberry PA, but it is listed all over the Web.and should be easy to obtain.

I have a whole host of threads where I owe some pics and I will catch up as soon as I figure this new camera out.

[MLS]

def interested in some pics. Sounds pretty sweet

[Lasermad]

Ahhh so its NOT a scrim netting for rear projection ...its a bright white covering for front projection
yeah i have seen this around , its very WHITE ! sure it is a terrific surface to project onto !

so is THIS the stuff



PAUL

[planters]

This is the same stuff. Your image shows the aluminized side. The scrim texture is invisible during projection, but prevents creases and hot spots.

[Lasermad]

The scrim texture is invisible during projection, .

I think my interpretation of the word "SCRIM" , is that its an invisable netting , a see through netting for rear projection so that kinda confused me .... this diamond foil looks great for surface projection that needs a boost.

6m x 12m wow thats pretty big , hope you will take some vids/photos

paul

[ShortyInCanada]

Actually a "SCRIM" is not invisible. In theatre applications you find that when the lighting is from the front that it performs much like any backdrop. The closer the weave the more opacity. And the more of an angle projected onto the fabric the less light going through to light the area behind. (Which is highly desirable if you are performing a "hidden" scene change behind the fabric.)
When you remove all light from the front and light up what is behind it the "SCRIM" becomes somewhat transparent, again depending on the tightness of the weave of the fabric. Even then, in most cases, the "SCRIM" is usually "flown" out or removed when not needed anymore.
The coolest effects are when you rear project onto a "SCRIM" hiding the surroundings and then fade out the projection as you bring up the lighting of the scene behind it. Match up positions of the image with live actors or objects and most people don't notice the transition.

So how would this aluminized surface work if you rear projected onto it ? Would it help to display the image through evenly so that it is an even brightness on the other side ? (Almost like bending the light around each thread for viewing on the other side.)

[planters]

I should clarify my description of this material. I come from more of an industrial background and for applications where an increase in the tensile strength of a thin membrane is desired, scrim is often woven into or laminated between plastic sheets. The completely opaque white and aluminized polythene films of Diamond Foil become slightly thicker, much stronger and textured when they are laminated on to each side of the scrim. When I compared this material to low cost cloth or cellulose coated plastic film as an opaque backdrop the Diamond Foil was much brighter and has much less "memory" and lays flatter. It preforms similarly to a dedicated video projection screen. Rear projection application will not work as no light can penetrate this material.

[ShortyInCanada]

I see.
Thank you for the clarification.
Sounds like the sort of fabric that is used for "soft" light reflectors in photography and filming. The white is used for a more diffused and "gentler" fill in lighting and the `silver' side is a much stronger light when "bouncing" the ambient light.(sunshine)

Yep.
Very useful stuff.

[planters]

That's right, except this stuff is way cheaper.