PrimaLuceLab Adapter from M81 to M54 with stop ring for ESATTO 3"

This PrimaLuceLab M81 to M54 Adapter with stop ring provides a secure, precisely aligned interface between the ESATTO 3" focuser and any M54-threaded camera or imaging accessory. The integrated stop ring ensures consistent, repeatable positioning, preventing rotation shifts and maintaining perfect optical alignment—ideal for astrophotographers fine-tuning backfocus or building stable imaging trains. With high-quality machining, smooth threads, and clean pre-owned condition, this adapter delivers a dependable, low-profile connection for advanced ESATTO 3" setups.