We are here to help
Monday to Saturday - 10:00am-4:00pm
Primaluce Lab ESATTO 4'' Robotic MicroFocuser
Primaluce Lab ESATTO 4'' Robotic MicroFocuser
Primaluce Lab ESATTO 4'' Robotic MicroFocuser

Primaluce Lab ESATTO 4" Robotic MicroFocuser

(Inc. 20% VAT)
Loyalty Points: 1,225
Low stock, Shipped in 1-2 working days
Product Code
Email us a question about this ProductPrimaluce Lab

ESATTO (EXACT) 4" robotic micro focuser!

The ESATTO 4" is the large dimensions robotic microfocuser that we designed for observatory class telescopes or for astrographs that need for large free aperture, like the Takahashi FSQ-106. Compared to the smaller models, ESATTO 4" offers a larger free aperture of 102mm, a longer draw tube travel of 35mm and a higher payload capacity of 10 kg, always with the incredible technical features of all the ESATTO focusers: incredible resolution of 0.04 microns per step, USB-C port for computer control, WiFi connection with included Virtual HandPad and ARCO rotator port.

Primalucelab Esatto 4"

Comparison of dimensions: ESATTO 2" (left), ESATTO 3" (center) ed ESATTO 4" (right).


The ESATTO 4" is the largest robotic microfocuser in the ESATTO family and, thanks to the large 102mm free aperture and high 10kg payload capacity, it's perfect for large professional telescopes usually found in observatories or for astrographs offering a large corrected image circle that require the use of focusers with large free aperture, like the Takahashi FSQ-106.

ESATTO 4” robotic microfocuser - main features:

- Crayford style focuser with 40 ball bearings, specially designed for very high load capacity (up to 10 kgs) with no flexure
- Low profile design with only 65mm thickness (91mm with internal flange).
- 35mm focuser travel with an incredible resolution of 0.04 microns per step!
- Remotely controlled from EAGLE or any Windows computer, with dedicated control software or ASCOM drivers.
- USB-C connector offering greater reliability and can be connected to any USB type port thanks to the included cable.
- Remote control with WiFi from any smartphone, tablet or computer and ESATTO Virtual HandPad app also for visual use!
- ARCO port to easily connect the ARCO rotator to the ESATTO without the need for additional data or power cables.
- Weight: 2050 gr.

All-in-one design for the best performance also with professional telescopes

ESATTO 4" has all the most advanced technologies that allow you to get the best performance from your telescope: incredible resolution capacity of 0.04 microns per step, design with XX bearings to offer exceptional precision and load capacity, reversible USB-C port for control from EAGLE or any external computer, ARCO port for use together with the optional robotic rotator, dimmable status LEDs that can also be turned off, WiFi connection with Virtual HandPad included for use even without a computer.

Primalucelab Esatto 4" Ports

The perfect focuser for Takahashi FSQ-106 astrograph

Thanks to special optics, Takahashi FSQ-106 is one of the best performing astrographs and it's used by the best astrophotographers in the world. The special internal corrector is so large that it requires a very large focuser to use it. For this reason ESATTO 4" is the ideal focuser for the Takahashi FSQ-106 telescope thus allowing remote and high precision control even of very heavy cameras and accessories.

Primalucelab Esatto 4" FSQ106

An ESATTO 4" installed on a Takahashi FSQ-106 (with the optional adapter) and with optional M92x1 adapter. The FSQ-106 telescope is shown with PLUS 125mm support rings.

Special adapter for Takahashi FSQ-106 and to connect Takahashi photographic adapters

In order to allow you to install ESATTO 4" in place of the original Takahashi focuser, we have designed a special adapter that makes ESATTO 4" have the same thickness of the original focuser. In addition, we have created an adapter to be screwed to the M110x1 thread of the ESATTO 4" draw tube to convert it into an M92x1 female thread which is the same as the one on the original Takahashi focuser. In this way you can remove the original focuser, install ESATTO 4" with the optional adapters and you will find focus point with the same photographic adapters you used before!

Primalucelab Esatto 4" FSQ106

Primalucelab Esatto 4" Mechanical Diagram

Dimensions of the ESATTO 4" robotic microfocuser.




Specifications: Primaluce Lab ESATTO 4" Robotic MicroFocuser

What's in the Box

What's in the Box: Primaluce Lab ESATTO 4" Robotic MicroFocuser

Reviews (0)

Be the first to Write a Review for this item!


At The Widescreen Centre, we prioritize prompt order processing and dispatch. We strive to dispatch all orders on the same day or the next working day, depending on the time of your order. We hold extensive stocks to ensure that your items are ready for immediate despatch. Please note that the cut-off time for same-day dispatch is usually 1:30 p.m.

For delivery within Mainland UK, we use reputable couriers to provide efficient service. You can expect your package to arrive in 1-2 working days. Please note that a signature may be required upon delivery to ensure a secure receipt.

In the case of special order items, the delivery time may be longer. If you have any concerns or questions about the delivery of your item, please don't hesitate to Contact Us. We are here to assist you.

Should there be any delay in dispatching your order, we will notify you to keep you informed.

Please be aware that The Widescreen Centre cannot be held responsible for any postal or third-party delays that may occur. We are committed to providing a reliable and efficient delivery service for our valued customers.

For more information please click here

FAQ - Have a question about this product? Fill in the form below and we will get back to you as soon as we can!

Also Bought
PrimaLuce Lab Telescope Adapters for Esatto 4''
PrimaLuce Lab Telescope Adapters for Esatto 4"
From  £149.50