Rare gauge between Super 8 and 16mm—narrower stock, longer runtime than Super 8, sharper grain. Niche in art film and archive transfers; virtually extinct in modern production.
28mm film occupies a peculiar gray area between established formats. Today, you'll practically only find it in specialized archives or with artists consciously experimenting with analog material. The format was never an industry standardization; it arose more from pragmatic reasons: film manufacturers needed a medium between Super 8 (too grainy, too short running time) and 16mm (too expensive, too bulky for many applications). The 28mm width allowed for longer running times than Super 8, while simultaneously offering better optical quality and more manageable equipment than 16mm.
Practically irrelevant on set or in editing today—those shooting analog now either choose Super 8 (aesthetics, cost-effectiveness, nostalgia) or jump directly to 16mm (professional standards, better archival quality). You'll primarily find 28mm material in film museums or during the restoration of older sub-standard films from the 1960s and 1970s. Its perforations differ from Super 8, and the spools are not compatible with standard projectors. This makes digitization expensive and complex.
Anyone still working with 28mm—for example, in an experimental context or with found footage projects—must rely on specialized labs. The graininess falls between Super 8 and 16mm; under magnification, it shows significantly more texture than Super 8, but not the fineness of 16mm material. Color negatives from this era may have developed color casts; preservation is fragile. Those digitizing such material should work with high optical resolution—at least a 2K scan, preferably 4K—to optimally utilize the marginal image sharpness.
In the context of sub-standard film archaeology and artistic practice, 28mm is experiencing a small renaissance: artists appreciate the format's "in-between" status as a metaphor and its material fragments as a visual statement. Technically, however, it's an anachronism. Those who want to work with an analog aesthetic today use Super 8 or switch to digitally simulated looks—28mm remains both a curiosity and a restoration challenge.