Hmmm. I bought a few yards of different types of material. They are all nylon. One is a flag bunting, one is a heavier cordura, and I don't remember the third. Think back pack/tent material. I don't know if they are flame retardant, but my home-mades keep the material over a foot from the bulb (a 500 wat worklight). I've had them on for an hour at a time with no problems. I got them at a big fabric store. None of them were over 10 bucks a yard. They all diffuse differently, and I am still experimenting with them.
[quote author=Jim Brennan link=board=lighting;num=1104603944;start=0#1 date=01/04/05 at 19:40:04]Hmmm. I bought a few yards of different types of material. They are all nylon. [/quote]
White polyester silk is available through fabric stores. They even sell the color coded nylon banding to finish the edges.
If you're on the left coast, you can look up the King family in Buena Park who own a company specializing in soft-goods mfg. for films - Independent Rental and Sewing. In addition to the basics, they make some proprietary stuff for use on their own features.
The Kings grip for DP Robert Richardson on a regular basis and have come up with some wacky rigs to achieve the look he demands. I don't have their number anymore, but used to buy all my open face, butterfly and overhead fabrics from them. Nice folks.
realize that quartz bulbs can explode and will spray very hot stuff on to your silk and if it's not flame retardant, it will ignite. plus the heat can build up quite high inside a chimera, since it is enclosed. Spontanius combustion can happen if things get hot enough. I don't think it's worth the hazzard.
You can buy just replacement silks from Chimera but the bag that surrounds the light is also flame retardent. There's a reason things cost what they do. I find Chimeras and the copies to be very reasonably priced for the durability you get.
Also, you will probably be altering your color temp. and that will change as the heat discolors the material.
I don't have a tent on mine. I have to throw up a flag on a stand now and again for light spill, but I don't want to worry about the heat build up. Really, after as much as an hour, the diffuser is warm, but NOT hot. And I have had zero problems with color temp. I also keep the glass shield in place in case the bulb explodes. For me it was a worthwhile, low budget alternative to an expensive softbox.
Of course you could actually buy the silk material from a lighting shop. I think it was about 6.25 a linear foot. A roll was about 125.00. That might be a good solution.
I went to Jo-Ann fabrics (a large scale fabric store) and bought 10 yards of light grid cloth - a synthetic silk - I can't quite remember the exact name but you'll know it by feel. It works really, really, well.
My stepson, a former videographer, gave me a roll of a plastic sheeting material for light diffusion. He said it wouldn't burn, but it could melt. It's rolled up with a sheet of clear plastic to protect it. Anyone know what this is and how it would compare to fabric?
If it is on a stiff cardboard tube, and about 4' long, it sound like a diffusion. Lee, or Roscoe, or some other. For that you would clip it onto the outside (0r inside) of the barn doors.
As for how it would comapre to fabric, it's used in a slightly different way. It still diffuses the light, but the source is smaller. One thing you could do is attach it to a 4x4' "gel frame" and clamp that onto a c-stand. That works well.
Does it have any number on it, like 216, or something like that?
When you hold it up to say a light bulb across the room, can you see a point source coming thru, or is it just milk?
[quote author=webpro link=board=lighting;num=1104603944;start=0#9 date=01/10/05 at 08:39:54]Get aparachute from a surplus store[/quote]
That's a good idea. However, if you are shooting something with a highly reflective surface (like a car's windshield), then you might see the numerous seams within a parachute.