Bed Sheet Diffuser - How Do You Make One?

Hello.

I have a photo shoot tomorrow and it's likely going to be sunny, so I don't want to have to depend on very direct sunlight. I remember a while back I was looking at some pictures of a setup for a shoot, and saw how someone was holding a huge block of sheet at an angle over the model between the model and the sun. I can tell he either used wood or PVC pipes, but I don't know how to set it up like that. Can anyone put instructions on how to make a sheet diffuser with PVC pipes but keep the sheet tight enough so it doesn't have much motion? Thank you!
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Tinker Tubes, Dean Collins at his DIY best. http://ehartfordstudios.com/blog/wp-content/uploads/2010/08/tt-book.pdf
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I was able to find out what to use before, but instead of a diffuser screen it ended up a backdrop stand / changing screen. =) I've been able to take some good pictures using the stand lately.
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For those who will read this posting, using a diffuser to soften the direct sunshine is a good idea, and making your own may save you some money, but it is a lot simpler to simply shoot in the shade.

The last time I saw a bed sheet diffuser in action was on a Dean Collins instructional video where he was shooting a woman and her horse outdoors in direct sunshine.  The diffuser was I suppose about seven or eight feet square and stretched over a lightweight aluminum frame to keep it taught.  The whole thing weighed I suppose about 20 pounds (or about 9.5 kg) and there was a slight breeze.  It took four men to hold it in place. If you have four strong people to hold it while you are shooting more power to ya, but as I said before step into the shade where you will have a whole lot less problems with overexposed backgrounds and so forth.

Benji
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It was too big to use as a diffuser but it serves perfectly as a backdrop stand now. I just need a queen-size sheet, I put it on with safety pins, and it's good to go. It's not easy when it's windy but it's worth it when I can pull off some good shots.
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Let's see them.
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Here's one. =) I've only managed to use the pipes and a black sheet at least twice. Once for these boys and their father, and another for my friend with the lava lamp. I plan to use the pipes again this Saturday when I can purchase a queen-sized white sheet. I can't find a yellow one to represent youth (I'm about to start my own youth project). -.-
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Next time you use it would you mind taking a shot of the setup and posting it so we can see what your box looks like?
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Sure! I don't mind, I might use it soon. =)
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