The ESATTO 3.5" LP → ARCO 3" adapter (PrimaLuceLab, SKU: PL3600467 ) is a dedicated connector used for direct, axial connection of the ARCO 3" rotator with the ESATTO 3.5" LP low-profile focuser. This allows the creation of an integrated focusing and framing system while maintaining minimal back-focus gain.

Key Features

• fitted collar on the ESATTO 3.5" LP extractor side
• fitted collar on the rotator side ARCO 3"
• optical thickness ≈ 0 mm – no noticeable impact on the back-focus budget
• full rotator aperture (≈ 76 mm) – no vignetting for full-frame sensors
• CNC machined 6061-T6 aluminum body, hard anodized – lightweight, stiff and corrosion resistant
• internal blackening and grooving – reduced reflections, better contrast

Set components

• ESATTO 3.5" LP ↔ ARCO 3" adapter
• four stainless steel M4 mounting screws

Technical parameters

• extractor side: collar adapted to the ESATTO 3.5" LP front
• rotator side: flange adapted to ARCO 3"
• optical thickness: ≃ 0 mm
• Inner diameter: 76 mm
• material: aluminum 6061-T6, black anodized
• EAN: 8059020774103
• manufacturer: PrimaLuceLab – Italy

The PL3600467 is the key link for users who wish to combine the precise, low-profile focusing of the ESATTO 3.5" LP with the high-resolution framing of the ARCO 3", creating a compact, fully automated optical path without compromise in throughput and back-focus.