In a somewhat "retro" development, many stereo photography buffs used the Nimslo to take stereo slides which were mounted in "4P" (half frame) slide mounts. This was done by using either slip in cardboard mounts, some specially labeled with the Nimslo name or aluminum masks such as the Realist "closeup" mask. These masks were sometimes put in metal frames and placed between glass, much like Realist format slides. The resulting stereo slides could then be viewed using conventional Realist format viewers or even projected with stereo projectors.