The ESATTO 4" → ARCO 3" adapter (PrimaLuceLab, SKU: PL3600459 ) is a dedicated collar connecting the low-profile ARCO 3" rotator with the ESATTO 4" focuser. It allows you to create a compact, fully automated focusing and framing unit without noticeable back-focus gain, while maintaining the full 76 mm aperture of the rotator.
• direct connection of the ARCO 3" front with the ESATTO 4" output – no additional adapters
• optical thickness ≃ 0 mm – practically does not change the back-focus budget
• full 76mm internal diameter – no vignetting even with full-frame sensors
• CNC milled body made of 6061-T6 aluminum, hard anodized - high stiffness and corrosion resistance
• blackened and grooved interior - reduced reflections, better contrast
• ESATTO 4" ↔ ARCO 3" adapter
• set of M4 mounting screws (stainless steel)
• extractor side: collar adapted to the ESATTO 4" front
• rotator side: flange adapted to ARCO 3"
• optical thickness: ≃ 0 mm
• Inner diameter: 76 mm
• material: aluminum 6061-T6, black anodized
• EAN: 8059020773977
• manufacturer: PrimaLuceLab – Italy
The PL3600459 is a key component for users who want to combine the precise, wide ESATTO 4" focuser with the ARCO 3" rotator, providing a compact and rigid optical path ready to work in the most demanding astrophotography setups.
