I did a search, and there were far more than 18 pages... I tried to find the article, but didn't succeed. Probably I dreamt about it...
Nope. 18 pages of topic headings
when you use the key words 'Depth of Field', searching all forums and all posts.
You can narrow the search by looking only for topic titles
that contain the key words "Depth of Field'. You then get just one page of topic headings.
Oddly, the term DoF is not recognised by the search engine.