ZWO EFW FILTER WHEEL 8 x 1.25"
The Next Generation 2025 ZWO Electronic Filter Wheel 8 x 1.25" is a major upgrade over the previous generation with a new anti light-leak design and refined mechanics for smoother, more consistent rotation.
The new 2025 EFW series introduces a series of structural refinements to eliminate light leakage from all directions, including:
Upgraded Sealing | A re-engineered slot-fit chassis provides a tighter mechanical interface between the front and rear covers, minimizing potential ingress points for stray light.
Dual Light-Blocking Protection | Newly-added light-blocking pads on both lateral connection interfaces creates an addition optical barrier, resulting in cleaner, more uniform frames during long exposures.
Fully Enclosed Motor Compartment | The motor assembly is now completely sealed, improving both light isolation and environmental resistance for more reliable operation over time.
Like the previous generation, the 2025 EFW 8 x 1.25" is CNC machined and has an optical thickness of only 20mm. This model can take 8 x 1.25" mounted or 8 x 31mm round unmounted filters.
The power absorption of the EFW is only 120mAh @ 5V so any USB cable can power it up. The EFW connects to your imaging system via the built-in USB-C port using the included USB2.0 Type-A to Type-C cable.
The internal filter carousel is made from 6061 aluminium alloy, reducing weight while maintaining exceptional strength and stability. A high-precision stepper motor ensures consistent, reliable rotation with precision position indexing.
Specifications
| Compatible filters | 8 x 1.25" mounted, 8 x 31mm round unmounted |
|---|---|
| Ports |
USB Type-C |
| Power draw | 120 mA @ 5A |
| Power supply | USB cable |
| Maximum thickness of the filter | 31 mm round unmounted: 1.5 - 3.5 mm, 1.25" mounted: ≤7 mm |
| Optical thickness | 20 mm |
| Camera connection |
M42 x 0.75 female |
| Telescope connection | M42 x 0.75 female |
| Camera compatibility | 4/3" or smaller ASI cooled cameras or cameras with M42 x 0.75 threads |
| Weight | 530 g |
| SKU | ZWO-EFW-8x1.25-25 |
Items included
- 8 x 1.25" EFW body
- 1.25″ cover
- 1.25″ holder
- M42 x 0.75 male to male adapter
- 1.25" T2 nosepiece
- 6 x M2.5 x 6mm screws
- 26 x M2 x 4mm screws
- 2 x M4 x 12mm screws
- 3 x 75 Phillips head screwdriver
- 1.25" female barrel adapter
- USB 2.0 cable (2m)
- 10 x Filter masks
- USB 2.0 Type A - C cable (0.5m)
Backfocus solutions
55mm backfocus with 4/3" or 1" cooled cameras
55mm backfocus with 4/3" or 1" cooled cameras and OAG
Downloads
