PrimaLuceLab ARCO 3-inch - Field Rotator and Derotator
ARCO rotator for this ESATTO, requiring the PL3600467 adapter (sold separately). The rotator and adapter take up 26 mm; check the draw and clearance.
CHF 1'099.00incl. Swiss VAT
The ESATTO 3.5″ LP is a motorized eyepiece holder from PrimaLuceLab designed for telescopes with limited rear space. Its 32-mm body provides a clear aperture of 90 mm and a focusing travel of 10 mm.
CHF 1'109.00incl. Swiss VAT
Reference FOCUS-0012
Will be ordered for you
Timeframe: 10 days to 3 weeks
Estimated shipping: Between November 13 and 18, 2026
The ESATTO 3.5″ LP is a motorized eyepiece holder from PrimaLuceLab designed for telescopes with limited rear space. Its 32-mm body provides a clear aperture of 90 mm and a focusing travel of 10 mm.
The low-profile design is intended for astrographs and other instruments with a short remaining backfocus. According to the manufacturer’s specifications, the eyepiece holder can support up to 10 kg. Its movement is controlled with a resolution of 0.01 µm per step. This resolution refers to the motor’s step size; it does not represent an absolute measure of focus accuracy for any given camera or telescope.
The movable tube travels toward the telescope end. On the camera side, the M98x1 female thread accommodates optional stop-ring adapters, which allow the camera to be locked at the desired angle. This direction of travel must be taken into account when determining the instrument’s mechanical clearance.
The USB-C port connects the eyepiece holder to EAGLE or a Windows computer. PLAY enables its use in an astrophotography setup; the ASCOM driver allows control via compatible third-party software. Wi-Fi and the Virtual HandPad also allow for control via a phone or tablet. The status LEDs can be dimmed to minimize their brightness during a session. The presence of a thermal sensor port does not mean that a thermal sensor is included.
The telescope-side and camera-side adapters must be selected separately based on the interfaces and available space. The stop rings on the camera adapters are used to lock the camera’s orientation. The 32 mm measurement refers to the eyepiece holder body and does not represent the length of a fully equipped optical train. When selecting extension tubes and adapters, you must take into account the corrector, the camera, and the focus position.
The ARCO port allows you to power and control a rotator via a single dedicated connection, without a USB connection or an additional 12 V power supply directly to the ARCO. This makes it possible to adjust the framing and use field de-rotation in a compatible altazimuth configuration. The rotator and its adapter remain optional. The manufacturer specifies that a USB cable is included for connecting to a computer, but the product page does not explain why a universal connector kit or an AC power adapter is automatically included in the package.
| Reference | PLLEST35LP |
|---|---|
| Version | ESATTO 3.5-inch LP |
| Body thickness | 32 mm |
| Free opening | 90 mm |
| Race | 10 mm |
| Reported charge | 10 kg |
| Resolution | 0.01 µm per step |
| Mass | 1,150 g |
| Connections | USB-C, Wi-Fi, ARCO port, temperature probe port |
| Control | PLAY, ASCOM driver, Virtual HandPad |
| Camera Interface | M98x1 female |
Here are a few accessories we've selected for this model, depending on your needs.
ARCO rotator for this ESATTO, requiring the PL3600467 adapter (sold separately). The rotator and adapter take up 26 mm; check the draw and clearance.
