Ensure precise control over your imaging setup with the ZWO EFW 8-Position Filter Wheel for 1.25" and 31 mm Filters (2025). Designed to accommodate up to eight 1.25" astrophotography filters or 31 mm unmounted filters, this filter wheel provides versatile support for both monochrome and color cameras with small sensors.

The ZWO EFW 8-Position Filter Wheel combines robust hardware with advanced software compatibility, including reliable driver support and a high-performance stepper motor for accurate, repeatable filter positioning. The next-generation light leak design minimizes unwanted stray light, preserving image quality across long exposures.

Ideal for deep-sky imaging, this filter wheel allows seamless integration of a wide range of astrophotography filters, enabling complex filter sequences and rapid adjustments during imaging sessions. Whether enhancing specific targets or executing multi-filter imaging routines, the ZWO EFW 8-Position Filter Wheel delivers the precision and reliability required for professional-grade astrophotography.

The ZWO EFW 8-Position Filter Wheel for 1.25" and 31 mm Filters (2025) is designed for flexible integration, whether in a visual back configuration or a fully threaded optical train. The kit includes adapters compatible with ZWO camera packages, allowing seamless installation with both Pro cooled and uncooled cameras. By following the system chart below, you can configure either a 1.25" imaging setup or a threaded train based on the industry-standard backfocus. It is also compatible with cameras featuring similar native backspacing; however, additional spacers or adapters may be required for non-ZWO systems.

The ZWO EFW 8-Position Filter Wheel for 1.25" and 31 mm Filters (2025) provides rapid, precise filter changes, enabling efficient preparation for imaging sequences and target acquisition. Its eight-position internal carousel supports 1.25" mounted filters up to 7 mm thick, as well as 31 mm unmounted filters ranging from 1.5–3.6 mm thick. This broad compatibility accommodates a wide range of modern small-sensor cameras and allows you to carry full LRGB or SHO astrophotography filter sets, with additional space for a dark filter. Filters are positioned smoothly, silently, and accurately using a high-performance stepper motor, ensuring reliable and repeatable operation during imaging sessions.

Operation of the ZWO EFW 8-Position Filter Wheel for 1.25" and 31 mm Filters (2025) is straightforward, thanks to ZWO’s extensive system compatibility. The filter wheel connects via a USB Type-C port, allowing for simple and reliable setup even in low-light conditions. Native support through ZWO’s ASIAir system, combined with ASCOM compatibility, ensures seamless integration with a wide range of popular astrophotography devices and software, providing precise and convenient control over filter selection during imaging sessions.

The ZWO EFW 8-Position Filter Wheel for 1.25" and 31 mm Filters (2025) includes a comprehensive set of accessories to enable immediate system integration. For imaging train connections, the package provides an M42M–M42M (T2–T2) adapter, a 1.25" nosepiece, and a rear 1.25" compression fitting. Power and data connections are facilitated via included 0.5 m and 2 m USB A to USB-C cables. Three sets of screws—6× M2.5–6, 26× M2–4, and 2× M4–12—along with a 10× filter mask set, support secure bolt-through camera connections and unmounted filter installation. Additionally, 1.25" protective covers help maintain a sealed system when not in use, and a Philips-head screwdriver is provided to assist with assembly.