Adjective
half-frame (not comparable)
(photography) Being or relating to a kind of film camera using a film format of half the usual exposure size of a 35mm camera.
Ducati made a marine binocular called the BIMAR for the Kriegsmarine during World War II, some of which were sold on the civilian market after the war. citation The Ducati Sogno was a half-frame Leica -like camera which is now a collector's item. Source: Internet
Some of these cameras were full-frame; some were half-frame, and at least one Robot camera produced an unusual square-sized image on the 35 mm frame. Source: Internet
The half-frame format, allowing 72 pictures of 18 × 24mm format on a standard 36 exposure roll of film, made Pen cameras compact and portable for their time. Source: Internet
This was a half-frame 35mm camera. Source: Internet