The ESATTO 4" → ARCO 2" adapter (PrimaLuceLab, SKU: PL3600423 ) connects the ESATTO 4" precision focuser with the ARCO 2" rotator, creating a compact focusing and framing unit with a full 50.9mm diameter and virtually zero back-focus increment.

Key Features

• fitted collar on the side of the ESATTO 4" lift and the ARCO 2" rotator
• optical thickness ≈ 0 mm – no noticeable impact on the back-focus budget
• Inner diameter 50.9 mm – full capacity ARCO 2"
• CNC milled body made of 6061-T6 aluminum, hard anodized - lightweight, stiff and corrosion resistant
• blackened, grooved interior - effective reduction of reflections

Set components

• flange-adapter ESATTO 4" ↔ ARCO 2"
• four M4 mounting screws (stainless steel)

Technical parameters

• extractor side: collar adapted to the ESATTO 4" front
• rotator side: flange adapted to ARCO 2"
• optical thickness: ≃ 0 mm
• Inner diameter: 50.9 mm
• material: aluminum 6061-T6, black anodized
• EAN: 8059020773991
• manufacturer: PrimaLuceLab – Italy

The PL3600423 adapter allows you to integrate the wide, stable ESATTO 4" focuser with the ARCO 2" rotator, providing fully automated focusing and framing with minimal space requirements in the optical path.