Astroasis 9-Position Filter Wheel (9×1.25″, 31mm, 36mm)

The Oasis Filter Wheel 9 position filter wheel is the new standard for filter management in astrophotography. With an ultra-flat 21mm profile and an elegant, CNC-machined aluminum body, it combines exquisite aesthetics with mechanical precision. Inspired by the elegance of a fine watch and the precision of a vinyl record player, it delivers unmatched accuracy, reliability, and usability for serious imagers. This is the world’s first and only 9 position filter wheel for filters under 50mm.

Full of unique features, you’ve never seen a filter wheel quite like this before.

Key Features:

• Ultra-slim profile — Only 21mm thick with fully internal motor — it’s the world’s first completely FLAT filter wheel.
• Clock-like precision — Special friction-based belt drive with mechanical switch positioning. No backlash.
• CNC-machined body with oversized central screw lock — Overbuilt rigidity and mechanical stability. Astroasis’ central screw lock provides maximum rigidity and is a massive improvement over competing designs.
• Repeatable Calibration Frames — Filter changes are exact and repeatable every single time, making the capture of flats & lights reliably headache-free night after night. 
• Supports 36mm/31mm unmounted & 1.25″ mounted filters — all at once
• Includes free filter frames — Easily convert 36mm and 31mm unmounted filters into secure, screw-in filters, making cleaning and removal of your filters take mere seconds.
• Completely sealed — Engineered anti-light-leak system including shell, ports, screw holes, and filter windows
• Compatible with most mainstream brands — ZWO, QHY, Touptek, Player One, OGMA, and Astroasis brand compatibility. If you are unsure about compatibility, please reach out to us or check our diagrams below.
• Tool-free filter changes — Install or swap filters without screws or risk of damage
• USB-C powered & controlled — Single cable, driver-free USB HID interface
• No COM port conflicts — USB-HID provides plug-and-play functionality on Windows, macOS, and Linux, without ever requiring or conflicting with highly problematic COM ports.
• Operates down to -30°C — Ideal for remote or winter observatories

The First-of-its-Kind 9 Position Wheel

This is the only 9 position astronomical filter wheel capable of handling 1.25″, 31mm, and 36mm filters – all at the same time! If you’re like us, you love new and unique products. This filter wheel is the only model to cater specifically to an audience with smaller filters, allowing you to fit your image train with additional filters such as UV/IR, “Darks” Filters, Spectroscopy, H-beta, Methane, and more. Why limit yourself to 7 filters?

A Wheel Like No Other

That’s right, 9 positions aren’t the only trick we have up our sleeves. Oasis Filter Wheels are the world’s first completely flat filter wheels.  No more gaudy motor assemblies hanging out of the back of your filter wheel, or hard edges to snag cables on. Our motor is completely contained within the CNC-machined housing, and features a backlash-free belt drive.

At only 21mm thick, the Astroasis Filter Wheel is the sleekest filter wheel in the world.

Guaranteed Precision, Every Time

Repeatability and precision are non-negotiable for any astrophotographer’s filter wheel. If your filter wheel can’t consistently return to the exact same position, your flat frames won’t calibrate properly, resulting in uneven corrections—especially around the filter edges—and making image processing exponentially more difficult. Unlike other filter wheels that rely solely on imprecise encoders or magnets, the Astroasis Filter Wheel uses a robust mechanical switch to lock the wheel into position—every single time.

Here’s how it works: when you select a new filter, the unidirectional wheel rotates clockwise until the desired position is reached. Then, it reverses until the mechanical switch hits a physical stop (see image below). Once engaged, the wheel is locked firmly into place. This innovative locking mechanism guarantees your filter wheel returns to the exact same physical position night after night, filter change after filter change. It’s a feature you won’t find anywhere else—and one that delivers unmatched reliability and consistency for your astrophotography workflow.

Ease of Use, Exemplified

If you’ve ever set up a monochrome imaging rig, you know it’s tedious—there are 329 screws to handle (okay, maybe not quite that many), and dealing with expensive filters always comes with the risk of damage. The usual advice? Take your time. But for us, “good enough” isn’t good enough. We asked ourselves: How can we make this better? That question drives every Astroasis product.

Turn Your Unmounted Filters into Mounted Filters — Effortlessly

Astroasis has developed custom filter frames that transform your unmounted 31mm and 36mm filters into fully threaded, mounted filters—so you can simply screw them in. No more fiddling with tiny screws until your fingers hurt. Hate cleaning your filters because it takes forever? That hassle is gone too.

Our filter frames are as slim as filter masks, so they won’t eat up precious light path space—meaning no vignetting. If you’ve never used mounted filters before, you’ll be amazed at how much time and effort this saves. You’ll never want to go back.

Best of all: every Oasis filter wheel order includes a filter frame kit, of your choosing, free of charge (1.25″, 31mm, 36mm)

The Oasis Filter Wheel allows you to use 36mm unmounted, 31mm unmounted, and 1.25″ mounted filters — even simultaneously in the same disc. These frames allow for fast, tool-free filter changes and protect your filters from scratches or incorrect installation.

You can now mix and match your filter types, maximize your gear investment, and streamline workflow without ever changing the filter disc. Our filter wheel is a great investment if you have a smaller sensor, because when you’re ready to upgrade your camera and filters, you can just upgrade your filter frames to 36mm instead of needing a new wheel — best part is, you don’t even need to do it all at once. You can mix and match to your heart’s content.

No More Disassembly Hassles

Tired of dismantling your filter wheel just to mount your camera? We’ve designed access holes for every compatible camera model, so you can reach the screws easily—no disassembly required.

Not screwing around

We don’t cut corners. Our oversized central screw directly anchors into the filter wheel body, creating a rigid, flex-free connection. The result is a solid, stable filter wheel assembly that maintains its unparalleled rigidity in all conditions.

Zero Light Leak:

We poured countless hours into perfecting the Astroasis Filter Wheel design, leaving no detail overlooked—especially when it comes to preventing light leaks. Every filter wheel package includes a complete set of gaskets, masks, and specialized screws to seal every potential leak point, including the filters themselves.

The faceplate features an offset flange, and any open screw holes are easily covered by the included darkening screws. Even the USB-C port is designed to ensure your camera doesn’t catch any strays.

Included darkening tools are included with every filter wheel:

• Filter frames, gaskets, and masks (mounted and unmounted filters)
• OAG darkening gasket (telescope faceplate)
• Camera darkening gasket (camera side)
• Darkening screws (both faceplates)
• USB-C Proprietary gasket

 

Exceptional Mechanical Design:

• Friction-based belt drive ensures zero backlash and high repeatability
• Mechanical switch-based filter positioning independent of motor resolution or sensor error
• Large internal bearings provide stable, balanced rotation without adding weight
• Filter locking with reverse tension maintains precise alignment in all positions

Optimized Your Workflow:

• No disc removal needed — Cameras can be attached via screw holes accessible through the filter disc
• Dual mounting options — Swap your OAG or Camera in
• Quick and easy tool-free filter changes — Swap or clean your filters in seconds, not minutes.
• USB-C for both power and control — Clean, simple cable management
• Built-in temperature sensor for remote/environmental monitoring

Compatibility:

• Works with the following cameras via “bolt on.”
  • ZWO, QHY, ToupTek, Player One, OGMA, and any other camera that shares these screw design parameters (R29/R31/58mm/62mm)
• Works with the following OAGs via “bolt on”
  • ZWO, QHY, ToupTek, Astroasis, and OGMA
• Compatible with filters up to 3mm thick
  • Chroma & Astrodon Tested
• Most other cameras and OAGs still work, but you will need to use the threaded components to secure the filter wheel instead of screws. If you are unsure about compatibility, reach out to us before ordering.
  • Threaded adapters are included for common sizes (M42, M48, M54).
  • Additional tools, screws, spanner, and adapters included.

 

Whether you’re shooting narrowband targets in winter skies or running automated all-night sequences, the Oasis 9 Position Filter Wheel offers elite-level precision, durability, and ease of use — with thoughtful touches to elevate your imaging experience.