SPT - Vivitar Series1 35 85mm f28 VariFocal guide

Comprehensive technical guide for maintenance and repair of the Vivitar Series 1 35-85mm f/2.8 Varifocal zoom lens. This document provides detailed procedures for essential optical and mechanical adjustments to ensure optimal lens performance. Primary sections include adjustment locations for spacers and optical elements, with precise instructions for 85mm and 35mm focus adjustment, field curvature correction, centering, and diaphragm aperture sizing. The guide outlines adjustment procedures for focus ring operation, zoom ring brake application, diaphragm aperture rotation, and helicoid timing specifications. Disassembly highlights present step-by-step removal procedures accompanied by annotated photographs showing helicoid assembly and internal components. A dedicated section addresses frequently repaired areas, including helicoid impact damage and guide screw or roller shear failures. Practical troubleshooting tips are provided for repairs performed without complete disassembly. Technical drawings and detailed illustrations clarify specific adjustment procedures and component relationships, making this guide essential for technicians servicing this lens model.