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Version Introduction

QFocuser comes in two versions: Standard Version and Precision Version.

The Standard version is designed to be installed on the side of the standard adjustment axis of the telescope focusing mechanism. This is the same with most focusers available in the market. The High precision version is installed on the other side — the precise adjustment axis of the telescope focusing mechanism.

QFocuser (Standard Version)


QFocuser (High Precision Version)


Most electric focusers use a motor and reducing gears and once installed on the telescope manual focusing is not possible. However, the High Precision QFocuser is equipped with a non-reducing motor, allowing it to be manually adjusted even after installation on the telescope, without the need for a power connection or a clutch switch.


Another advantage of QFocuser High Precision Version is that it allows the entire system to achieve almost zero backlash. Backlash calculations involve the entire focusing system, including the focus motor mount, not just the electronic focuser itself. Backlash will exist if there are mechanical gears in the focusing system. Since the High precision QFocuser uses a non-reducing motor (i.e., no mechanical reduction gears) the added backlash from the motor is almost zero. Then, if a good focusing mount is used, the entire focusing system will operate with almost zero backlash. According to our test in NINA, with the backlash set to 0 in the Autofocus settings, the autofocus process runs smoothly.

Multiple Installation Options

QFocuser features several holes on its bottom and side, providing a variety of fixing methods. Unlike mounting plates with fixed holes, QFocuser adopts a flexible structure where the fixed holes position and mounting plate height can be freely adjusted to achieve the best compatibility with your telescope.

Software and Interface

QFocuser can be powered in two ways: TypeC-5V and 12V DC. Tbe USB 5V power is enough in most cases. Both the standard version and precision version support an external temperature sensor (included) for users who require temperature monitoring.

Additionally, a manual controller will be available as an optional accessory in the near future. This item allows direct operation of the electronic focuser without the need to connect it to a computer or touch the focuser.

Currently, QFocuser supports both Windows (with ASCOM drivers) and Linux systems. In the ASCOM driver, we have integrated basic functions such as move, custom current position, limit switches, torque maintenance, and temperature display, etc. It can also be controlled through other third-party software.


Version QFocuser(Standard Version) QFocuser(High Precision Version)
Body Size/mm About 43*39*50 About 43*39*50 (excluding the button)
Weight About 210g About 265g
Motor Reducing motor Non-reducing motor
Backlash It has some backlash, which can be calibrated in software like NINA  Almost zero backlash*
Max. Loads About 10kg About 7.5kg
Manually Focus After Installing Not supported Supported
System Supported Windows (ASCOM)



External Temperature Sensor Supported
Data Interface USB2.0 Type-C
Power Supply 5v/12v

What’s in the box (Standard Ver)

What’s in the box (High Precision Ver)

Beginning May 2024, an extra 5mm-2.5mm coupler will come as a standard accessory in the High-precision version.

Personal Upgrade Path

Buy risk-free: When it’s time to trade up you’ll get the most value for your used gear.