SPT - Vivitar Series1 35 85mm f28 VariFocal guide

Comprehensive service manual for the Vivitar Series 1 35-85mm f/2.8 Varifocal zoom lens, offering detailed repair and maintenance procedures for optical and mechanical adjustments. This workshop guide covers essential tuning of spacer positions and optical element placement to restore peak lens performance. You'll find precise focus adjustment instructions for both 35mm and 85mm focal lengths, field curvature correction, element centering, and diaphragm aperture calibration. The manual walks through focus ring operation, zoom ring brake tensioning, diaphragm rotation alignment, and helicoid timing setup. Step-by-step disassembly sections include annotated photographs that document helicoid assembly and internal component layouts, making complex teardown straightforward. A troubleshooting section addresses the most common failure points: helicoid impact damage, guide screw and roller shear breakage, and optical misalignment. Practical repair tips cover partial-disassembly approaches for localized fixes without full teardown. Technical drawings and detailed component illustrations clarify adjustment procedures and part relationships throughout, making this manual an essential reference for technicians working on this lens.