The lightweight and compact Starlight Instruments Electronic Focusing System (EFS) comes with a digital hub (control box) and hand controller and works with any ASCOM compliant software.

The hand controller has an innovative knob feature that allows you to can change the number of steps the focuser moves from 1 step, 10 step, or 100 step increments. Each step speed has an LED light mode, RED 1 step, Amber 10 step, 100 Green step.

Motor Required

The motor for the RedCat51 series of telescopes is sold as a separate items and can also be purchased from OPT. See these following link: RedCat51 Series Focusing System - motor system.

If you require a different motor, there are also full Electronic Focusing System kits with the motors included. See these following links to see these complete kits:

Available Kits

• Electronic Focusing System with HSM20 motor. 
• SI-EFS-HSM30 
• SI-EFS-HSM35 

A WiFi System can also be purchased if you choose to have control via a smartphone, laptop, or iPad devices.

Image Note: The motors and their red cables are shown for example of requirements only. They can be purchased via the links below.

Additional Information:

Control box is 4.13-inches (105 mm) long, 2.87-inches (73 mm) wide, and 1.1-inch (28 mm) thick.

The system draws a maximum 1 amp of power @ 12V and can be controlled by the provided USB cable.

Motors connect to the EFS control hub via Ethernet cable (red in images, supplied with separate motor purchase).

Hand controller is connected to the EFS control hub via RJ11 cable (supplied).

• Electronic Focusing System with hand controller and control box.
• Works with all ASCOM compliant software.
• Focus by 1 step, 10 step, or 100 step increments.
• All cables are supplied.
• Additional motor required.