MTO - MTO 1000A disassembly

This comprehensive workshop manual provides detailed step-by-step disassembly instructions for the MTO 1000A catadioptric telephoto lens (F 10/5, 1100mm focal length). Filling a significant gap in available repair documentation for Soviet-era optical instruments, this service manual offers precise procedures for systematically dismantling this M42-mount lens. The guide begins with complete technical specifications including M42 mount compatibility, 120mm filter thread, length ranging from 240mm (closed) to 300mm (extended), and comprehensive equipment requirements featuring flathead screwdrivers (1mm, 2mm, 2.5mm), a spanner wrench up to 120mm, and MicroLubrol Helimax-XP lubricant. Subsequent sections examine critical components with accompanying detailed photographs: the notched retaining ring (120mm diameter, 114mm inner thread), the M42 mount mechanism with two sets of retaining screws, and the inner and outer rings of the rear assembly. The manual documents precise screw dimensions and specifications for each component while specifically addressing the rear assembly locking mechanism, counterclockwise unscrewing procedures, and sight alignment adjustment techniques. This essential maintenance and repair guide serves optical technicians and vintage lens enthusiasts seeking to service, restore, or repair this demanding catadioptric design, providing practical guidance previously unavailable in accessible form.