ESATTO 3.5" LP focuser with ARCO 3" rotator (PrimaLuceLab, SKU: PLLEST35LPARCO3 ) is the smallest and lightest integrated focusing and rotation package in the PrimaLuceLab offer. It combines the ultra-low-profile ESATTO 3.5" LP focuser (body thickness 32 mm, free aperture 90 mm) with the precise ARCO 3" rotator (thickness 23 mm, resolution 1 arcsec/step). The whole thing together with the dedicated adapter takes up only ~55 mm of back-focus, making this set ideal for astrographs with very short focal reserve.

The most important features of the set

• ESATTO 3.5" LP - 90 mm free aperture, 10 mm travel, 0.01 µm/step resolution, 10 kg payload
• ARCO 3" - 0-360° continuous rotation, 1 arcsec/step resolution, 76.3 mm free aperture
• Low total thickness - focuser + rotator + adapter ≈ 55 mm back-focus
• One power supply and one USB-C - the rotator takes power and control signal directly from the hoist; fully supported by PLAY, ASCOM and INDI
• Built-in Wi-Fi (Virtual HandPad) - remote control from a browser without additional software
• Play-free mechanics - Crayford supported by ball bearings, steel drive rail
• PLUS system - M6 threads in the body facilitate the assembly of clamps and PrimaLuceLab accessories

Set components

• ESATTO 3.5" LP extractor
• ARCO 3" rotator
• adapter connecting ESATTO 3.5" LP ↔ ARCO 3"
• USB-C ↔ USB-A cable (1.5 m)
• ESATTO ↔ ARCO connecting cable
• 12 V DC / 5 A power supply (5.5 × 2.5 mm plug)
• a set of mounting screws and Allen keys
• user manual

Technical parameters

Focuser ESATTO 3.5" LP
• free aperture: 90 mm
• travel: 10 mm
• resolution: 0.01 µm/step
• body thickness: 32 mm
• axial load capacity: 10 kg
• weight: 1.45 kg

ARCO 3" Rotator
• free aperture: 76.3 mm
• resolution: 1 arcsec/step
• rotation range: 0–360°
• body thickness: 23 mm
Set (focuser + rotator + adapter)
• total thickness: ~55 mm
• free aperture: 76.3 mm
• interfaces: USB-C, Wi-Fi 2.4 GHz, ARCO port
• power supply: 12 V DC / 0.5 A (rotator powered by ESATTO)
• operating temperature: −25°C … +40°C
• manufacturer: PrimaLuceLab – Italy

The ESATTO 3.5" LP + ARCO 3" package delivers sub-micron focusing precision and accurate camera rotation in one super-slim module, ideal for modern astro-telescopes with relatively short back-focus and high optical bandwidth requirements.