RB Focus Merlin HD 3.0 Electronic Focus Motor

FYI: With this focuser you must supply 12v power AND USB-C Connection.  This allows this focuser to handle heavier payloads.

See Here for the AC Adapter if needed

• Take the guesswork out of focusing with the RB Focus Merlin HD 3.0 Electronic Focus Motor, a powerful heavy-duty autofocus solution designed by astrophotographers, for astrophotographers.
• Built to deliver precision focusing for astronomical telescopes, the Merlin HD 3.0 helps you achieve sharp, repeatable focus without manually moving your telescope to bright stars.
• Offers ultra-fine focusing accuracy with 16,000 steps per revolution and precision down to 0.7 microns, making it a serious upgrade over manual focusing methods.
• Features a robust Nema 17 motor with strong torque performance, giving the system the power needed for demanding imaging setups.
• Manufactured in Spain with high-quality CNC-machined aluminum construction for a compact, durable, and professional-grade design.
• Includes Sensorless AutoHoming technology, which helps automatically calibrate focuser position and return to the last applied focus point, reducing the risk of lost positioning.
• Uses DirectDrive transmission technology to help avoid mechanical play and maintain smooth, responsive focusing performance.
• Equipped with IntelligentSilentDrive for ultra-quiet operation, actively adjusting motor force for a smooth and quiet focusing experience.
• Built-in sensors include a digital thermometer, helping support temperature-aware focusing workflows during changing night conditions.
• Features Bluetooth antennas to help reduce cable clutter and weight in your telescope setup.
• Powered by a Dual-Core processor for smooth autofocus performance while simultaneously updating screen data and handling internal functions.
• Integrated full-color IPS LCD screen lets you monitor focuser activity, saved configurations, and real-time movement directly from the unit.
• Manual focusing can be controlled through the mobile application, making it convenient for visual observing, planetary imaging, and computer-free adjustments.
• Compatible with popular astrophotography capture platforms including APT, SGP, N.I.N.A., Voyager, KStars, and EKOS through ASCOM and INDI support.
• Works with color cameras, DSLR cameras, monochrome cameras, reflector telescopes, and refractor telescopes, making it a flexible choice for a wide range of astrophotography setups.
• Compact and lightweight at just 280g, the Merlin HD 3.0 adds advanced focusing performance without adding unnecessary bulk to your rig.

Specifications

• Product Type: Electronic focus motor / autofocus motor
• Brand: RB Focus
• Model: Merlin HD 3.0
• Motor Type: Nema 17
• Dimensions: 42mm x 60mm x 70mm
• Weight: 280g
• Torque: 4.5 N/m
• Precision: 0.7 microns
• Step Subdivision: 16,000 steps per revolution
• Drive Technology: DirectDrive
• Silent Operation Technology: IntelligentSilentDrive
• Auto Calibration: Sensorless AutoHoming
• Processor: Dual-Core processor
• Display: Full-color IPS LCD screen with automatic on/off
• Sensor: Digital thermometer / temperature sensor
• Connectivity: USB 2.0 and Bluetooth antenna support
• Data Interface: USB Type-C connection
• Software Compatibility: ASCOM and INDI compatible software
• Supported Capture Software: APT, SGP, N.I.N.A., Voyager, KStars, and EKOS
• Power Requirement: 12V DC
• Power Connector: DC jack 2.1mm x 5.5mm
• Standard Format Compatibility: SkyWatcher models with dual-speed focusers, TS, GSO, William Optics, and similar focusers
• Large Format Compatibility: Feathertouch and similar focusers
• SCT Format Compatibility: SkyWatcher Maksutov, Celestron SCT, and Meade SCT models; size consultation recommended
• Recommended Use: Astrophotography autofocus, visual observing focus control, planetary imaging, and automated imaging sequences
• Country of Manufacture: Spain

What's in the box?

• RB Focus Merlin HD 3.0 electronic focus motor
• Temperature sensor
• USB Type-A to USB Type-C cable
• Shaft coupler with self-aligning system
• 4mm shaft adapter
• 2.5mm shaft adapter
• 3.5mm Takahashi shaft adapter
• Adapter for Crayford dual-speed focusers with 27mm reducer

Software and Docs

• Compatible with ASCOM and INDI software platforms
• Works with supported capture programs including APT, SGP, N.I.N.A., Voyager, KStars, and EKOS
• Mobile app control available for manual focusing
• Power adapter is not included
• Product documentation may vary by package or retailer