Originally Posted by CPorter
come on, why should it let neglible light through, sounds like you are agreeing that where I want to read just fog must also have density from light.



Quote Originally Posted by RalphLambrecht View Post
Quote Originally Posted by CPorter View Post
come on, why should it let neglible light through, sounds like you are agreeing that where I want to read just fog must also have density from light.
yes, i do!
NO !!! The black tape used by CPorter as a mask should NOT let any light through. When I used the word negligible I intended it to mean "a sufficiently small amount (of light) that will not contribute to any measurable increase in density". Letting light through the tape that contributes to a density increase is contrary to the intention of using the black tape in the first place !!