Astronomy Specialist


$1,049.00 AUD

Prima Luce Lab


This used Prima Luce Lab ESATTO 3" robotic microfocuser is in perfect working order and comes with the original box, power cable and USB C cable. As with all used items, there may be cosmetic imperfections but these do not affect the performance or functionality. Photos are of the actual item. 

Click here for instructions on how to install the ESATTO to refractor telescopes.

ESATTO 3" is the new robotic focuser with an 8kg payload capacity and an incredible resolution of 0.04 micron per step. It can be controlled via USB cable on any Windows computer or via Wi-Fi using a smartphone or tablet. 

ESATTO 3" has a 76mm free aperture, 25mm of draw tube excursion and communicates directly to the ARCO camera rotator. It is designed for astrophotography but it also works extremely well for visual use. 

 ESATTO 3” robotic microfocuser - main features:

  • Crayford style focuser with 28 ball bearings, specially designed for very high load capacity (up to 8kg) with no flexure
  • Low profile design with an optical thickness of only 58mm (77mm with internal flange)
  • 25mm focuser travel with an incredible resolution of 0.04 microns per step!
  • Special adapters to easily connect it to many different telescopes
  • It can be directly controlled by EAGLE or any Windows computer with dedicated control software or ASCOM drivers
  • USB-C connector
  • Wi-Fi capability from any smartphone, tablet or computer
  • ESATTO Virtual HandPad app for visual use
  • Many camera threaded adapters with stop ring on the camera side to rotate the camera to the desired angle
  • ARCO port to easily connect the ARCO camera rotator without the need for additional data or power cables
  • Weight: 1345 g

Designed to offer the best performance for astrophotography

The special Crayford design with 28 ball bearings allows ESATTO 3” to have an impressive 8kg payload capacity with the focusing smoothness that is required by modern astrophotography techniques (eg. autofocusing with V-curve). ESATTO 3” has a draw tube with 76mm of free aperture and 25mm of travel.

Many adapters available 

You do not need to worry about how to connect ESATTO to your telescope as there are many adapters available. You can easily connect ESATTO 3” to telescopes like Schmidt-Cassegrains, Aplanatic Schmidt-Cassegrains, refractors, Cassegrains, Newtonians and more. ESATTO truly is the universal focuser and if you cannot find an adapter for your telescope, just contact us.

Designed for remote control via Wi-Fi, from any smartphone, tablet or computer via the ESATTO Virtual HandPad app

ESATTO has a built-in Wi-Fi connection for remote control so you can operate it from any smartphone, tablet or computer. Just connect your device to the Wi-Fi network of ESATTO and start the Virtual Hand Pad through your browser. Its convenient preset settings allows to record and move the focuser to specific predetermined positions. The Wi-Fi control works even if ESATTO is connected to a computer so you can control it simultaneously from 2 devices.

Focuser draw tube with M81 x 1 thread and stop ring for a perfect camera connection

To avoid any camera tilt or optical train flexure, ESATTO 3" has a M81 x 1 male thread where you can screw on an adapter for your camera or accessory. The optional 2" visual back is generally only used for visual observations. The stop ring allows to lock the camera at a precise angle to better frame the object.

Prima Luce Lab ESATTO 3" robotic microfocuser camera connections

Connection with a single cable to ARCO

ESATTO includes a special port for ARCO, the robotic camera rotator.  With ARCO you can remotely control the rotation angle of your camera to achieve perfect framing of the object. ESATTO and ARCO are designed to work together as you will only need one short connector between the two!


8 kg

Clear aperture

76 mm


0.04 micron / step

Draw tube excursion

25 mm

Thread on camera side

M81 x 1 male


1345 gr


115 mm x 150 mm x 75.5 mm 



  • Prima Luce Lab Esatto 3"
  • Power supply cable
  • USB-C cable

ZWO camera software Manual (English)

ZWO camera software Manual (Italian)

ZWO camera software Drivers

ZWO camera software Esatto useful articles

To have access to the latest version of the manual, software package and firmware visit 

To connect Esatto via WiFi to your computer, smartphone or tablet and use the virtual hand pad: 

  • Connect your device to the focuser WiFi network ESATTOxxxxx;
  • Enter the password "primalucelab", 
  • Open your browser and enter the address

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$1,049.00 AUD

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