neutral density film

Tracy Ching <SysAdmin> tching at target.uucp
Wed Jun 30 10:50:18 EST 1993

In article <37790 at> pedro at (P Aphalo) writes:
>cawiah at GARNET.BERKELEY.EDU wrote:
>: We are looking for neutral density film to reproducably alter light
>Cheesecloth is also effective, as metal, or plastic scrim, or mosquito 
>netting, just do not use anything that is not either grey or black.
>That is unless you want to change the R:FR ratio.
>Pedro.Aphalo at (metla=Finnish Forest Research Ins

	Pardon the rookie question, but...  What is the R:FR ratio?

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