I just installed a couple of sheet of Focal Point AN glass in one of my Durst 8x10 carriers. I use it top and bottom, which is important with certain films
slick on even the emulsion side, especially in this foggy climate. One problem with small films, however, is that you might need a finer AN pattern like
the official Durst glass provides (if you can still find it), and might need to shim oversize glass at the edges with similar film. Or do what I do, cut out the smaller film area from a large piece of opaque polyester sheet of similar thickness. A lot also has to do with the incidence of the light rays. Works
best with a diffusion source and "normal" to longer than normal enlarging lenses. There is also a distinction between how dye clouds in color film are
affected versus silver grains with black and white film, namely, a matter of the best AN glass for any given combination of format, film, and lens.
Sheet films are a lot more forgiving than small roll film, due to both their large size and relative flatness. 120 film is the worst because keeping it
consistently flat requires a very good holder. But going "glassless" seems like utter barbarism to me.
