A cheap fill reflector can be had with a textured foil covered automobile windscreen reflector. These are inserted against the windscreen when parking in the sun to keep the car cooler. The surface gives a nice difuse light with very soft shadows.

Or you can just tape aluminum foil, matte side out, to a section of cardboard.

To actually reduce the direct glare, cheesecloth makes a nice shade filter. A frame of plastic plumbing pipe is lightweight, strong and if strategically selected joints aren't solvent welded it can be dismantled for transport.

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