Ensure precise control over your imaging setup with the ZWO EFW 7 Position Filter Wheel for 36mm Filters (2025). Designed to accommodate up to 7 36mm astrophotography filters, this filter wheel provides versatile support for both monochrome and color cameras with small sensors.

The ZWO EFW 7-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 7-Position Filter Wheel delivers the precision and reliability required for professional-grade astrophotography.

The 2025 version of the ZWO EFW 7-Position Filter Wheel for 36mm filters 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 7-Position Filter Wheel for 36 mm Filters (2025) is engineered for seamless integration with ZWO Pro cameras and puck-style cameras, either as a standalone accessory or in combination with the ZWO OAG-L. Passthrough holes on both the front and rear covers enable direct attachment of cameras and the OAG-L for secure, precise alignment. For setups without the OAG-L, the included M54 external to M48 internal threading adapter allows connection to the front cover and the 16.5 mm spacer provided with most ZWO Pro cameras, maintaining the industry-standard 55 mm backfocus for optimal imaging train configuration. The rear cover features M54 threading, offering the flexibility to construct imaging trains without a direct camera connection.

Operation of the ZWO EFW 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 7-Position Filter Wheel for 36 mm Filters (2025) includes a comprehensive set of accessories to enable immediate setup. For imaging train connections, the kit provides an M48 to M54 step-up ring, an M54M–M42F adapter, and an M54M–M48F adapter. Power and data connections are supported via 0.5 m and 2 m USB A to USB-C cables. Two sets of screws—6× M2.5–6 and 26× M2–4, along with a 10× filter mask set, facilitate secure bolt-through camera connections and unmounted filter installation. A Philips-head screwdriver is also included to simplify assembly and ensure your system is ready for imaging right out of the box.