Okay thanks for the reply.
So lets see if I understand this. Equivalent Neutral density means that we have the correct ratios of each dye layer so that when the human eye is looking at it with the correct illuminant, it will appear grey? So how do we quantitatively quantify the amount of "equivalent Neutral density"? Are we just measuring log(total light projected/absolute total light transmitted) or do we use a visual filter. Depending on how I measure the transmitted light through the film, I can get different density readings, this is one of the things Im confused about and why I ask about the visual filter.
Also, I have seen sources discuss an equivalent neutral density in reference to an individual layer. For example "the cyan layer has an E.N.D. of 1", how can one single layer be said to have an E.N.D. reading? It seems to me that E.N.D. refers to all 3 layers collectively so that you can get a grey color. you cant get grey with just one layer. Im struggling to understand this.
Last edited by retro film; 01-17-2013 at 12:08 PM. Click to view previous post history.