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.

Specifications

Items included

1. 7 x 36mm EFW body
2. 1.25 cover
3. 1.25 holder
4. M42 x 0.75 male to male adapter
5. 1.25″ T2 nosepiece
6. 6 x M2.5 x 6mm screws
7. 26 x M2 x 4mm screws
8. 2 x M4 x 12mm screws
9. 3 x 75 Phillips head screwdriver
10. 1.25″ female barrel adapter
11. USB 2.0 cable (2m)
12. 10 x Filter masks
13. USB 2.0 Type A – C cable (0.5m)

Backfocus solutions

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)

Downloads