SPT - January/February 1972

This January/February 1972 issue of the SPT Journal (Vol. 3, No. 1) from the Society of Photo-Technologists marks the first in a dedicated series of workshop manuals created by and for independent camera repair technicians. The entire issue focuses on detailed service documentation for the Petri Color 35, a compact 35mm camera from the early 1970s. The publication opens with an editorial statement of purpose: to deliver authoritative repair and maintenance information written by experienced field technicians, filling gaps where factory service manuals are either unavailable or poorly suited to the needs of independent repair shops. The technical content covers the Petri Color 35 comprehensively, including exposure control and light metering operation, shutter speed accuracy specifications (ranging from ±10% to ±50% tolerance), flash synchronization details (X contact mode), the helical focusing mechanism, film speed dial settings (ASA/DIN scales), and the complete film transport architecture with thorough explanation of wind lever mechanics, take-up spool drive engagement, and rewind operation. A crucial section documents a pre-disassembly inspection of an actual reference camera unit, recording baseline measurements and observations that serve as essential reference data for technicians undertaking maintenance, adjustment, or repair work on this model. The manual functions equally well as both a technical troubleshooting guide and an operational reference for anyone servicing the Petri Color 35.