PrimaLuceLab ALTO-2 Lid Motor for GIOTTO

ALTO-2 Lid Motor for GIOTTO

The PrimaLuceLab ALTO-2 moves a compatible GIOTTO panel into position to use it as a remote-controlled cover and set up flat-field sequences without requiring any intervention in front of the telescope.

ALTO-2 is the core of the system: the GIOTTO light panel remains a separate device. PrimaLuceLab states that it is compatible with models up to 320 mm, and the GIOTTO 255, 285, and 320 are the documented compatible models. Therefore, the choice should not be based solely on the assumption that a smaller panel would automatically be compatible with this arm.

The motor is powered by 12 V. It features a USB-C port for connecting to a Windows computer or an EAGLE, and a Wi-Fi connection that allows it to be controlled from a phone or tablet. The Virtual HandPad provides access to movements and settings without requiring an additional physical controller.

Motion Control and Calibration

The PLAY software allows you to calibrate the open and closed positions of the mount. This step is performed with the ALTO and GIOTTO actually mounted on the telescope. Compatible third-party software can also use the ASCOM CoverCalibrator driver. Even when using the motor remote control, you must still verify that the panel has enough space to complete its movement.

The USB and 12 V pass-through connectors allow you to connect GIOTTO to ALTO using short cables. The computer recognizes both devices separately, and they can be controlled individually. The CLC clips are used to secure the cables so that they follow the arm and the panel.

Mounting on the instrument

The PLUS PLLMORVLP clamp is an attachment option for a Vixen or Losmandy dovetail. Depending on the telescope and the length of its rod, a different mounting configuration or a longer rod may be necessary to position the mechanism in front of the tube. The ALTO body also features M6 threaded holes for a suitable mounting without this clamp.

The motorized mechanism allows for opening and closing, but PrimaLuceLab notes that when GIOTTO is used with ALTO, it does not completely seal the telescope’s entrance against light. The manufacturer therefore does not recommend this combination for capturing dark frames and instead suggests using a library of dark frames. The cover’s function should not be equated with that of a light-tight shutter.

Announced Items

The listed contents include the ALTO-2 engine, an 85-cm USB-B to USB-C cable, an 85-cm 12-V cable, and a quick start guide. The description also mentions the CLC clips. These connectors are used to connect the ALTO to the GIOTTO. The GIOTTO panel and the optional mounting clamp should not be listed as included with the motor alone.

Technical specifications

PrimaLuceLab Official Fact Sheet

Manufacturer's illustration