I only have the Betterscanning ANR glass for 35mm.It fits in the supplied 35mm plastic film holder,ie the film is IIRC about 3mm above the glass.After processing I place the film in the holder and the ANR glass on top.Generally this is not heavy enough to flatten the curl across the width so I jam the ANR glass down with pieces of card between the edges of the glass and the short vertical posts in the holder. Newtons rings do not occur.This is for a V700.