History of the 'Enhancing' filter

I quite often use the 'redhancer' filter. In fact it is my second most used filter after the polarizer. I own a Cokin P sized one and another made by Marumi, Japan. I rediscovered this article written by the inventor of enhancing filter, Howard G Ross from Robert Monaghan's medium format site recently.

A very good page on filters exist in Bob's archived site. To visit that page click here.

It would be great if someone can provide me a picture of Ross' enhancing filter.