Tom M wrote:
How about a reflective ND filter?
Edmond Scientific has them. I think I might have some laying around.
Send me an email at t miller @ u maryland . edu. (remove the spaces)

I don't think an ND filter will work. The reflector needs to reflect the
light in a consistent direction, whereas the ND filter will disperse the
light randomly, I believe.

Thanks for the suggestion though!

Best wishes,

Chris