PrimaLuceLab ESATTO 3.5" LP focuser with ARCO 3" rotator

Here’s a detailed product description for the bundle PrimaLuceLab ESATTO 3.5″ LP Focuser + ARCO 3″ Rotator — a premium motorised focuser and camera-rotator combo designed for demanding astrophotography setups.

What’s included

• The ESATTO 3.5″ LP low-profile robotic focuser. PrimaLuceLab ESATTO 3.5″ LP 

• The ARCO 3″ camera rotator / field de-rotator. PrimaLuceLab ARCO 3″ 

• A dedicated adapter to mount ARCO to the ESATTO and ensure seamless integration. 

Key Features & Benefits

Here are the notable features and how they benefit your astrophotography workflow:

ESATTO 3.5″ LP Focuser:

• Ultra-low profile: only ~32 mm thick body, making it well-suited for telescopes with limited back-focus.

• Large clear aperture: 90 mm free aperture for the optical train. 

• Travel: 10 mm of draw-tube travel — sufficient for focus shifts in imaging train setups. 

• Payload capacity: Up to ~10 kg (≈ 22 lb) of imaging train weight, meaning heavy cameras, filter wheels, OAGs, etc are supported. 

• Ultra-fine resolution: ~0.01 micron (10 nm) per step focusing resolution — enabling extremely precise focus, ideal for high-magnification or long-exposure astro work. 

• Modern connectivity: USB-C port, WiFi support, ASCOM / PLAY software compatibility for remote/autofocus workflows. 

ARCO 3″ Rotator / Field De-rotator:

• Low profile design: only ~23 mm thick body in the 3″ version; free aperture ~76.3 mm. 

• High precision rotation (1 arc-second per step) – gives extremely fine control of camera rotation or field de-rotation on alt-az mounts. 

• Seamless integration: connects to the ESATTO via a short cable, eliminating the need for separate USB & 12V cables for the rotator. (Just one USB cable to the ESATTO, plus the short inter-device cable.) 

• Works both as a camera rotator (on equatorial mounts) and as a field de-rotator (on alt-az mounts) — giving you flexibility in mount configuration. 

Bundle Specifics:

• When combined, the bundle offers a total optical train thickness of just ~58–59 mm (depending on adapter) while maintaining ~76.3 mm free aperture. 

• The design aims to simplify cable management and reduce mechanical complexity while offering high precision focus and rotation control.