The Next Generation 2025 ZWO Electronic Filter Wheel 5 x 2″ 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 5 x 2″ is CNC machined andhas an optical thickness of only 20mm. This model can take 5 x 2″ mounted or 5 x 50mm 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

Items included

1. 5 x 2″ EFW body
2. 6 x M2.5 x 6mm screws
3. 26 x M2 x 4mm screws
4. USB 2.0 Type A – C cable (0.5m)
5. USB 2.0 cable (2m)
6. 10 x Filter masks
7. M54 x 0.75 Male to M48 x 0.75 Female 0mm adapter
8. M54 x 0.75 Male to M42 x 0.75 Female 0mm adapter
9. M54 x 0.75 Male to M48 x 0.75 Female 2mm adapter
10. 3 x 75 Phillips head screwdriver

Backfocus solutions

55mm backfocus with 4/3″ or 1″ cooled cameras with T-2 Tilter

55mm backfocus with 4/3″ or 1″ cooled cameras with T-2 Tilter and OAG

55mm backfocus with APS-C cooled camera and standard OAG

55mm backfocus withfull frame cooled camera and OAG-L

55mm backfocus withfull frame cameras and no off-axis guider

Downloads