PrimaLuceLab ESATTO 3.5 LP Robotic Focuser

The PrimaLuceLab ESATTO 3.5 LP is a robotic focuser specifically designed for demanding astrophotography configurations where available backfocus is limited. With a mechanical thickness of only 32 mm, it is particularly suitable for astrographs and telescopes where preserving optical backfocus is essential.

Despite its compact design, the ESATTO 3.5 LP provides a large 90 mm clear aperture. This makes it suitable for imaging trains using large astronomy cameras and heavy imaging accessories.

The system provides 10 mm of focuser travel and a resolution of 0.01 micron per step. This extremely fine movement allows highly precise focusing adjustments and is particularly suitable for automated astrophotography applications.

The ESATTO 3.5 LP has a payload capacity of 10 kg. It can therefore support heavy imaging configurations including astronomy cameras, filter wheels, off-axis guiders, rotators and other accessories.

The control electronics are fully integrated into the focuser. A USB-C connection allows the ESATTO 3.5 LP to be controlled from a PrimaLuceLab EAGLE or a Windows computer.

The ESATTO 3.5 LP also includes WiFi connectivity, allowing wireless control from a smartphone or tablet.

A dedicated ARCO port allows direct connection of a PrimaLuceLab ARCO camera rotator. This integration makes it possible to combine robotic focusing and camera rotation within the same astrophotography system.

A temperature probe port is also provided, allowing temperature variations that may affect focus during an imaging session to be monitored.

The ESATTO 3.5 LP also features dimmable LED lights. Their brightness can be adjusted to suit nighttime observing and imaging conditions.

With its compact 32 mm mechanical thickness, large clear aperture, precise movement and high payload capacity, the PrimaLuceLab ESATTO 3.5 LP is particularly suitable for advanced and professional astrophotography systems requiring a high-performance robotic focusing solution.

Technical specifications

• Manufacturer: PrimaLuceLab
• Model: ESATTO 3.5 LP
• Type: Robotic focuser
• Application: Astrophotography
• Version: LP
• Mechanical thickness: 32 mm
• Clear aperture: 90 mm
• Focuser travel: 10 mm
• Resolution: 0.01 micron per step
• Payload capacity: 10 kg
• Computer control: Yes
• Connection: USB-C
• PrimaLuceLab EAGLE compatible: Yes
• Windows compatible: Yes
• WiFi connection: Yes
• Smartphone control: Yes
• Tablet control: Yes
• ARCO port: Yes
• PrimaLuceLab ARCO rotator compatible: Yes
• Temperature probe port: Yes
• LED lighting: Yes
• LED brightness adjustable: Yes
• Designed for telescopes with limited backfocus
• Particularly suitable for astrographs
• Integrated control electronics

Searching for the best low profile motorized focuser with high payload capacity and large free aperture? The ESATTO 3,5” LP is the solution for all telescopes that, like astrographs, have low backfocus! The ESATTO 3,5” LP comes with all the most advanced technologies included in all our ESATTO focusers: USB-C port, ARCO rotator compatibility, WiFi connection, many optional cameras and telescopes adapters and PLAY astrophotography software!

ESATTO 3,5” LP low profile robotic focuser - main feature:

- Special low profile design for high load capacity (up to 10 kgs) and precision.
- Low profile with only 32mm thickness.
- 10mm focuser travel with an incredible resolution of 0.01 microns per step!
- Special optional adapters to easily connect to many different telescopes.
- Remotely controlled from EAGLE or any Windows computer, it's also provided with ASCOM driver.
- USB-C connector offering greater reliability and can be connected to any USB type port thanks to the included cable.
- It works also with PLAY astrophotography software, much more than a standalone program.
- Remote control with WiFi from any smartphone, tablet or computer and ESATTO Virtual HandPad app for visual use!
-Many threaded camera adapters with stop ring on the camera side to rotate and keep the camera in the optical axis.
- ARCO port to easily connect the ARCO camera rotator and field de-rotator to the ESATTO without the need for additional USB or 12V power cables.
- Weight: 1150 gr.

The best low profile robotic focuser

The ESATTO 3,5” low profile robotic focuser has been designed to meet the most demanding requests of telescopes with low backfocus, like many astrographs. This way, with a body thickness of just 32mm, you can take advantage of a motorized focuser with a very large 90.0mm free aperture that is able to carry up 10 kg of imaging accessories.

Designed to give your telescopes the best performances for astrophotography

The special design gives ESATTO 3,5” LP an impressive 10 kg (22 lb) of payload capacity with the focusing smoothness that is required by modern astrophotography techniques (eg. autofocusing with V-curve). ESATTO 3,5” LP has a draw tube with 90.0mm of free aperture, and 10mm of travel, offering to an incredible resolution of 0.01 microns per step!

It comes with PLAY, the Prima Luce AstrophotographY software.

ESATTO 3,5” LP comes with PLAY, the astrophotography software developed by PrimaLuceLab in order to record beautiful pictures of the night sky in the simpler way and with the telescope, mount and other accessories you prefer! PLAY includes many features needed for astrophotography and it allows you to configurate your telescope by selecting OTA and mount provided with ASCOM drivers (tested with ASCOM platform 6.4 and later), control focus with ESATTO or SESTO SENSO 2 and camera rotation with ARCO. In order to use PLAY you have to have at least ESATTO focuser or SESTO SENSO 2 focusing motor and, if you install PLAY in the EAGLE computer, it automatically adds more advanced features!

Many adapters available to connect to telescopes and cameras

ESATTO 3,5” LP draw tube travel moves on the telescope side and different optional pre-made adapters are already available to connect to different telescopes. If you can’t find the adapter for your telescope, in the user manual you find the dimensions of the telescope side adapter so you can manufacture your custom adapter. On the camera side, ESATTO 3,5” LP has a M98x1 female thread and, through a complete series of optional camera adapters with stop ring, it allows you to directly connect cameras or to the ARCO rotator. The stop ring allows you to lock the camera at a precise angle to better frame the object.

Connect with a single cable to ARCO to remotely control also the camera rotator and field de-rotator

ESATTO includes a special port allowing ARCO, the camera rotator and field de-rotator, to be directly connected. With ARCO, you can remotely control the rotation angle of your camera in order to achieve perfect framing of the object you want to record. If you have an alt-az mount, you can use ARCO to de-rotate the field without the need of an equatorial wedge! By connecting ESATTO 3,5” LP to ARCO 3” you will have a rotating focuser in just 58.5mm of thickness and 76.3mm of free aperture.