SESTO SENSO 3 Robotic Focusing Motor for External Focusers

• All-in-one robotic focuser motor designed for external Crayford and Rack-and-Pinion focusers in a compact, lightweight body

• Made in Italy by PrimaLuceLab for precision, reliability, and clean integration in advanced imaging rigs

• Integrated position encoder tracks focuser movement so you can turn the manual (coarse) knobs without losing position

• Automatic Position Recovery can return the drawtube to the last saved focus point after accidental/manual movement (delay adjustable 0–20 seconds)

• High precision focusing with 0.7 micron per step resolution (on focusers with 1:10 reduction) for repeatable focus in visual and astrophotography

• Self Centering Clamp 2 (SCC2) for fast installation without brackets, supporting focuser shaft diameters 25mm, 26mm, 33mm, and 37mm

  • Connects directly to 37mm shafts; adapters included for 25/26/33mm

• USB-C connectivity for modern, secure control from Windows 10/11 PCs or EAGLE computers (easy plug-in even in the dark)

• Built-in WiFi + Virtual HandPad lets you focus from a phone/tablet with no computer or physical hand controller needed

  • WiFi can remain active even while connected to a computer for flexible control

• ARCO rotator port enables direct connection to PrimaLuceLab ARCO with a single short cable for both power + data

• DARK mode with dimmable LEDs (or fully off) to eliminate stray light and protect night vision during imaging

• GHOST mode (with EAGLE) for cleaner cable management and backup communications if a USB issue happens

• Temperature sensor port supports optional probe for temperature compensation to help keep focus stable as conditions change

• Broad focuser compatibility with included bushings, supporting many setups such as:

  • Sky-Watcher EVOSTAR / EVOLUX / ESPRIT, Sky-Watcher Newton / Quattro

  • Takahashi FSQ-85 / FSQ-106 (with fine focus knob)

  • Baader SteelTrack, FeatherTouch, GSO RC 2" / 3", Explore Scientific focusers

• Weight: 370 g (0.8 lb) — easy on balance, perfect for portable rigs and permanent observatories

Specifications

• Type: Robotic focusing motor for external Crayford & Rack-and-Pinion focusers

• Focusing resolution: 0.7 micron/step (on focusers with 1:10 reduction)

• Shaft clamp system: Self Centering Clamp 2 (SCC2)

• Supported shaft diameters: 25mm / 26mm / 33mm / 37mm

• Connectivity: USB-C, WiFi (Virtual HandPad)

• Software/Control: PLAY software, ASCOM driver (third-party software compatible)

• ARCO support: Dedicated ARCO port (power + data)

• Modes: DARK mode (dimmable/off LEDs), GHOST mode (with EAGLE)

• Power: 12V DC, 5.5/2.5mm center-positive

• Temperature support: Port for optional temperature probe (temp compensation via compatible software)

• Weight: 370 g (0.8 lb)

• Origin: Developed & manufactured in Italy

What’s in the box?

• SESTO SENSO 3 focusing motor

• Shaft adapters: 25mm, 26mm, 33mm (37mm supported without adapters)

• 6 color-keyed bushings: red (2.5mm), black (2.8mm), blue (2.4mm), green (3.5mm), silver (3.1mm), gold (4mm)

• USB-C to USB-A cable

• 12V DC cigarette-style power cable

• Hex keys

• Quick installation guide

Software and Docs

• PLAY (PrimaLuceLab control software): focus control, presets, monitoring, and AutoFocus support

• ASCOM drivers included for use with popular third-party capture/automation platforms (e.g., autofocus routines and full workflow integration)

• Firmware updates supported through PLAY to keep features and compatibility current