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Unconditional Satisfaction GuaranteeNo Shipping Fees Above 302 Months to Decide. Returns Simplified.The Next Generation 2025 ZWO Electronic Filter Wheel 7 x 36mm 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 7 x 36mm is CNC machined andhas an optical thickness of only 20mm.This model can take7 x 36mm 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.
| Compatible filters | 7 x 36mm unmounted |
|---|---|
| Ports | USB Type-C |
| Power draw | 120 mA@ 5A |
| Power supply | USB cable |
| Maximum thickness of the filter | 36 mm round unmounted: 1.9 – 3.5 mm |
| Optical thickness | 20 mm |
| Camera connection | Direct screw connection to camera with tilt plate removed, M42 x 0.75 female |
| Telescope connection | Direct screw connection to ZWO OAG-L, M42 x 0.75 female |
| Camera compatibility | APS-C and smaller ASI cooled cameras or cameras with a male M42 x 0.75 thread |
| Weight | 515 g |
| SKU | ZWO-EFW-7×36-25 |
55mm backfocus with APS-C cooled camera and standard OAG
55mm backfocus with APS-C cooled camera and OAG-L
55mm backfocus with APS-C cooled cameraand no OAG (M42m-M48f 22.5mm extender sold separately)
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ZWO software and drivers |
