The Next-Generation 7×2″ ZWO EFW

A re-engineered internal design helps reduce light leakage, while the refined mechanics deliver smoother, more consistent rotation.

The exterior has been subtly streamlined, giving the wheel a cleaner and more cohesive look. Nothing dramatic. Just better in the ways that matter — so your imaging workflow stays steady, reliable, and quietly improved.

Compatibility

Engineered for full compatibility with all ZWO filters for dependable image quality.

Power & Connectivity

Draws only 120 mA at 5 V and runs entirely from a single USB connection—no external power supply needed.
Connects to your imaging system via the built-in USB-C port using the included USB 2.0 Type-A to Type-C cable.

Software Support

Works seamlessly with ASIAIR, ASIStudio, ASCOM, and the ZWO SDK for flexible control across platforms.

Driver-Free Design

True plug-and-play design with no driver installation required.

Anti Light-Leak Design

In deep-sky imaging, even small amounts of stray light can compromise your final image.

The new ZWO EFW introduces a series of structural refinements to eliminate light leakage from all directions

Upgraded Sealing Structure: A re-engineered slot-fit chassis provides a tighter mechanical interface between the top and bottom covers, minimizing potential ingress points for stray light.
Dual Light-Blocking Protection: Newly added light-blocking pads on both lateral connection points creates additional optical barrier, helping maintain clean, uniform frames during long integrations.
Fully Enclosed Motor Compartment: The motor assembly is now fully sealed, improving both light isolation and environmental resistance for more stable operation over time.

Refined Exterior Design

The new ZWO EFW features a refined laser-engraved finish and cleaner logo detailing, offering improved visual clarity and a more modern, professional look.

Interface Upgrade

The new ZWO EFW replaces the legacy USB Type-B connector with a modern USB-C interface, providing a more robust, reliable connection and simplifying plug-and-play integration with your imaging system.

Lightweight & Rigid

The new ZWO EFW uses a CNC-machined aluminum alloy body for a lighter, more rigid structure.
The internal filter carousel is made from 6061 aluminum alloy, reducing weight while maintaining excellent strength and stability. The result is a compact, durable design engineered for smooth, reliable operation.

Stable & Durable

The new ZWO EFW is equipped with a high-precision stepper motor, ensuring consistent rotation and stable operation across extended imaging sessions.

Automated Filter Switching

The new ZWO EFW features a motorized, bidirectional filter-wheel drive with precise position indexing. When paired with control software such as ASIAIR (sold separately), it enables automatic filter changes during a scheduled imaging session — enabling fully unattended, hands-free astrophotography.

Filter Size Requirements: for 2″ filter wheels

The filter drawer supports:

• 2″ mounted filters with a maximum overall thickness of 7mm and maximum thread length of 2.7mm
• 50mm diameter unmounted filters with thickness 1.5-3.5mm.