The ESATTO 4" focuser with ARCO 3" rotator (PrimaLuceLab, SKU: PLLEST4ARCO3 ) is a complete, remote-controlled focusing and frame rotation package for demanding astrophotography setups. The kit combines the large, high-lift ESATTO 4" focuser with the precise ARCO 3" rotator via a dedicated adapter, providing
only 93 mm of total thickness with 76.3 mm of free aperture . With one USB-C cable you control the focus and camera angle simultaneously, and full integration with PLAY software and ASCOM drivers makes it easy to automate sessions.
• ESATTO 4" focuser — 102.2 mm free focuser aperture, 35 mm stroke, 0.04 µm/step resolution, 10 kg payload, 65 mm body thickness
• ARCO 3" rotator - 360° rotation, resolution 1 arcsec/step, thickness 23 mm, free aperture 76.3 mm
• total thickness of the package (focuser + rotator + adapter) only 93 mm - ideal for short back-focus astro-graphs
• Crayford design with 40 ball bearings - zero deflection even with a heavy camera + filters set
• built-in Wi-Fi (Virtual HandPad), reversible USB-C port, LEDs with dimming option
• rotator power supply and control without additional cables - ARCO draws power from the ESATTO port
• full integration with PLAY, ASCOM and low-level PrimaLuceLab SDKs
• ESATTO 4" lift
• ARCO 3" rotator
• ESATTO 4" ↔ ARCO 3" adapter
• USB-C ↔ USB-A cable
• ESATTO ↔ ARCO connecting cable
• mounting screws and instructions
• free aperture of the package: 76.3 mm
• total thickness (focuser + rotator + adapter): 93 mm
• lift stroke: 35 mm
• focuser resolution: 0.04 µm/step
• load capacity: 10 kg
• rotator resolution: 1 arcsec/step
• rotation range: 0–360° (continuous)
• focuser weight: 2.05 kg
• interfaces: USB-C, Wi-Fi 2.4 GHz, ARCO port
• Power supply: 12 V DC (via ESATTO) / ARCO powered via ESATTO port
• manufacturer: PrimaLuceLab – Italy
The ESATTO 4" + ARCO 3" set is an ideal solution for observatories and advanced astrophotographers who require maximum focusing precision and fast, repeatable object framing while maintaining a short back-focus and high load capacity.
