High torque. Exceptional precision. Intelligent environmental monitoring. Meet the new inFocus Max electronic focuser, engineered for demanding astrophotography setups.
At Prometheus Astro, we believe that achieving perfect focus shouldn’t require expensive equipment, complicated wiring, or compromises in performance.
Today, we’re excited to officially introduce the Prometheus Astro inFocus Max, our new high-torque electronic focuser designed for astrophotographers who demand precise, repeatable focusing, reliable automation, and the power to handle heavier imaging equipment.
Combining a precision-geared stepper motor, integrated environmental sensors, USB-C connectivity, and broad astronomy software compatibility, inFocus Max brings professional-grade focusing capabilities to a compact, accessible platform.
Whether you’re imaging distant galaxies with a large refractor, capturing emission nebulae with a fast Newtonian, or operating a fully automated observatory, inFocus Max is built to help keep your images sharp throughout the night.
High Torque for Demanding Imaging Setups
Modern astrophotography equipment can place considerable demands on a telescope’s focusing mechanism.
Large cooled cameras, filter wheels, off-axis guiders, rotators, and other accessories add substantial weight to the imaging train. Moving that equipment with precision requires more than a basic motorized focuser.
inFocus Max features a high-torque geared stepper motor with a 100:1 reduction ratio, designed to handle focuser loads of up to 11 kg (24.3 lbs).
This makes it particularly well suited for larger refractors, Newtonian astrographs, and heavy imaging configurations where consistent mechanical movement is essential.
The high reduction ratio provides the mechanical advantage needed to move substantial loads while maintaining fine control over focus positioning.
For astrophotographers, this translates into a focusing system designed to deliver reliable movement even when working with demanding optical setups.
Precision Where Every Step Matters
In astrophotography, even small focusing errors can compromise hours of carefully collected data.
Fast optical systems, narrowband filters, and high-resolution cameras can be particularly unforgiving when focus shifts during an imaging session.
inFocus Max addresses this challenge through its precision-geared drive system, delivering an ultra-fine effective step angle of just 0.075°.
This fine angular resolution enables small, controlled adjustments, providing the foundation for highly repeatable electronic focusing.
When paired with compatible autofocus software, inFocus Max supports automated focusing routines that analyze star sizes and determine the optimal focus position.
Whether you’re performing an initial autofocus run, refocusing after a filter change, or compensating for temperature-related focus drift, inFocus Max is designed to give your imaging software the precise mechanical control it needs.
Intelligent Environmental Monitoring Built In
Temperature changes are one of the most common causes of focus drift during long astrophotography sessions.
As the night progresses, changes in ambient temperature can cause telescope components to expand or contract, gradually shifting the focal plane.
To help astrophotographers monitor these conditions, inFocus Max includes integrated environmental sensors measuring three key parameters:
- Temperature: Monitor ambient temperature changes that may affect focus position.
- Relative humidity: Track local moisture conditions around your imaging equipment.
- Barometric pressure: Access additional atmospheric information directly from the focuser.
By integrating these sensors into the focuser itself, inFocus Max eliminates the need for a separate environmental monitoring device for these measurements.
Temperature readings can also provide useful information for compatible imaging software and temperature-aware focusing workflows.
The result is a more informed and automated approach to maintaining focus throughout changing nighttime conditions.
One Cable. Power and Data.
Cable management is a familiar challenge for astrophotographers.
Every additional power adapter, controller box, or cable introduces another potential source of interference, cable drag, or connection problems during telescope movement.
With inFocus Max, we’ve kept connectivity deliberately simple.
A single USB-C connection handles both power and communication.
There is no need for a separate power adapter or external motor controller.
Simply connect inFocus Max to your imaging computer using USB-C, install the appropriate drivers, and integrate it into your astrophotography workflow.
This streamlined design makes installation cleaner and helps reduce cable clutter, particularly on portable setups and compact imaging rigs.
Designed for Your Existing Astrophotography Software
An electronic focuser should work with your imaging software, not force you to change it.
That’s why inFocus Max has been developed with support for widely used astronomy control standards.
The platform offers:
- ASCOM compatibility: Integration with compatible Windows astronomy applications, including N.I.N.A. and Sequence Generator Pro.
- ASCOM Alpaca support: Network-based device control through compatible applications.
- Planned INDI support: Future integration with INDI-based imaging environments.
These interfaces allow astrophotographers to incorporate inFocus Max into automated imaging sequences, including autofocus routines and focus adjustments between filters or during changing environmental conditions.
Our objective is to make inFocus Max a natural part of your existing imaging workflow, whether you operate a portable telescope or a more advanced observatory setup.
Compatible with ZWO EAF Mounting Accessories
Upgrading an electronic focuser shouldn’t mean rebuilding your telescope’s entire mounting arrangement.
To make installation and upgrades easier, inFocus Max uses a mounting arrangement compatible with ZWO EAF brackets and mounting accessories.
For astrophotographers already using a ZWO EAF, this offers a particularly convenient upgrade path.
In many cases, existing brackets and mounting hardware can be reused, reducing the need for additional adapters or mechanical modifications.
This also gives new users access to an established range of compatible mounting solutions for different telescope focusers.
As always, we recommend checking the mechanical compatibility of your specific telescope and focuser before installation.
Engineered for Strength Without Unnecessary Weight
inFocus Max combines carefully selected materials to achieve a balance of mechanical rigidity, durability, and weight.
The front and rear plates are manufactured from 6061 aluminum, providing robust structural support at the mechanical interfaces.
The central electronics housing uses carbon-fiber-reinforced PETG (PETG-CF), offering a lightweight and durable enclosure for the integrated control electronics.
This hybrid construction allows us to use metal where structural strength matters most, while avoiding unnecessary weight and manufacturing costs elsewhere.
It’s an engineering approach that reflects our broader design philosophy at Prometheus Astro: prioritize real-world functionality and performance over unnecessary complexity.
inFocus Max: Technical Specifications
| Feature | Specification |
|---|---|
| Motor | High-torque geared stepper motor |
| Gear reduction | 100:1 |
| Rated focuser load | Up to 11 kg |
| Effective step angle | 0.075° |
| Connectivity | USB Type-C |
| Power | USB-powered |
| Environmental sensors | Temperature, humidity, barometric pressure |
| Software interfaces | ASCOM, ASCOM Alpaca |
| Future software support | INDI planned |
| Mounting compatibility | ZWO EAF mounting accessories |
| Structural materials | 6061 aluminum |
| Electronics housing | Carbon-fiber-reinforced PETG |
Precision Engineering, Accessible Pricing
High-performance astrophotography equipment is often associated with premium pricing.
At Prometheus Astro, we’re working to challenge that assumption.
inFocus Max was developed around a straightforward objective: deliver the mechanical strength, focusing precision, and software integration required by serious astrophotographers at a price that makes these capabilities more accessible.
By combining efficient mechanical engineering, integrated electronics, and carefully selected manufacturing methods, we’ve created a focuser that prioritizes the features that genuinely matter during an imaging session.
Like the rest of our product range, inFocus Max is designed and assembled in Greece, supported directly by our team, and backed by our standard two-year warranty.
The Next Step in the Prometheus Astro Ecosystem
The introduction of inFocus Max is another important milestone in the expansion of the Prometheus Astro product lineup.
From our Týr harmonic drive mount to our electronic focusing and calibration solutions, our goal is to develop reliable, precision-engineered equipment that works together to make astrophotography more capable and accessible.
inFocus Max embodies that philosophy.
It’s powerful enough for demanding imaging configurations, precise enough for automated focusing routines, and simple enough to integrate into existing setups without unnecessary complexity.
More precision. More power. Less complexity.
Discover the Prometheus Astro inFocus Max
The new Prometheus Astro inFocus Max electronic focuser is now available to order through our official website.
Launch offer: €160 including VAT
Regular retail price: €200 including VAT.
Explore inFocus Max and Order Yours
For questions regarding telescope compatibility, mounting options, software integration, or installation, contact our team at support@prometheusastro.com.
Engineered for precision. Built for the stars.
The Prometheus Astro Team
