• Film Format: 828 roll film (paper-backed film similar in width to 35mm, yielding fewer frames without sprockets), also capable of half-frame or specialized paper-backed setups. • Lens / Focal Length: Built-in fixed lens (historically derived from the compact Argus Model M line, with 28-style designation depending on the branding variant like Camro 28 / Minca 28). • Body Material: Molded Bakelite plastic. • User Manual & Reference: Historical documentation can be viewed via the Butkus Argus Minca 28 Manual Archive