ARCO 3" robotic rotator (PrimaLuceLab, SKU: PLLARCO3 ) is a fully remote-controlled module rotating a camera or an entire filter wheel with a resolution of 1 arcsec/step . With a free aperture of 76.3 mm and a thickness of only 23 mm, ARCO 3" allows you to frame objects without adding significant length to the optical path. The rotator can work standalone (12 V DC power supply) or be connected directly to the ESATTO / SESTO SENSO 2 focuser via a dedicated ARCO port, eliminating additional power cables.

Key Features of ARCO 3"

• 0–360° continuous rotation with a resolution of 1 arcsec/step
• 76.3 mm free aperture – compatible with full-frame sensors
• ultra-low thickness of 23 mm – minimal impact on back-focus
• power supply and control with one cable from ESATTO (ARCO port) or SESTO SENSO 2* extractors
• USB-C interface and built-in Wi-Fi ( Virtual HandPad ) – supported by PLAY, ASCOM and INDI
• status LEDs with dimming function – work in the observatory without disturbing visual adaptation
• aluminum housing with M6 threads of the PLUS system – easy assembly of clamps and accessories

Set components

• ARCO 3" rotator
• USB-C → USB-A cable (1.5 m)
• connection cable for ESATTO / SESTO SENSO 2*
• 12V DC / 5A power supply (5.5 × 2.5mm)
• a set of mounting screws and Allen keys
• user manual

Technical parameters

• free aperture: 76.3 mm
• body thickness: 23 mm
• resolution: 1 arcsec/step
• rotation range: 0 – 360° (continuous)
• interfaces: USB-C, Wi-Fi 2.4 GHz, ARCO port
• power supply: 12 V DC / 0.4 A (center positive)
• compatibility: ESATTO (all models) / SESTO SENSO 2*
• manufacturer: PrimaLuceLab – Italy

ARCO 3" provides precise, repeatable framing of objects without bothersome mechanical play. When combined with the ESATTO focuser, it creates a low-profile, fully automated set ideal for modern astrographs.

*For SESTO SENSO 2 lifts the optional ARCO → SESTO cable is required.