ZWO EFW 7x36mm (2nd Generation) Electronic Filter Wheel
Available on backorder
Key Features
- 2nd generation 7-position electronic filter wheel for 36mm unmounted filters
- Lightweight & slim design: only 555 g and 20 mm thick
- Aircraft-grade CNC aluminum body with black anodized finish
- Japanese-made NPM stepper motor for quiet, precise rotation
- Direct connection to ZWO ASI cameras and M68 OAG
- Single USB2.0 cable operation, 120 mAh @ 5V low power use
- Compatible with ASCOM drivers and popular astrophotography software
Description
The 2nd Generation of ZWO EFW with 7 positions for 36mm unmounted filters
The ZWO EFW 7x36mm (V2) is a second-generation electronic filter wheel designed specifically for monochrome astronomy cameras. With space for up to seven unmounted 36mm filters, it offers smooth, reliable, and fully automated filter switching—essential for astrophotographers using LRGB or narrowband filters to capture deep-sky objects in stunning detail.
Milled from a solid block of aircraft-grade aluminum and finished with a sleek black anodized coating, the EFW is both durable and lightweight, weighing just 555 g (19.8 oz). Despite its strength, the wheel is only 20 mm (0.79") thick, making it compact enough for portable setups while maintaining excellent rigidity for long-term use.
Precision and Reliability
At the heart of the filter wheel is a high-quality stepper motor made in Japan by NPM, known for its precision, quiet operation, and long-lasting reliability. The wheel can rotate in both directions—clockwise or counterclockwise—giving you fast and efficient filter selection without delays.
Improved Connectivity and Flexibility
Compared to the original version, the V2 EFW 7x36mm features a larger body and new screw holes on both covers, allowing for stronger and more versatile connections. This design brings the filters closer to the camera sensor, reducing the risk of vignetting. It also enables direct connection to ZWO ASI cameras and compatibility with the M68 Off-Axis Guider (OAG), expanding your imaging options.
Simple Power and Control
The filter wheel is powered through a single USB2.0 connection—no bulky external power supplies or multiple cables required. It can be connected directly to your cooled CMOS’s USB hub or straight to your computer. With a low power consumption of just 120 mAh @ 5V, it integrates seamlessly into any astrophotography setup. Control is handled via ASCOM-compatible software or ZWO’s own drivers, ensuring wide compatibility with popular imaging applications.
Filter Compatibility
The carousel supports up to seven unmounted 36mm filters. For best results, ZWO’s own 36mm LRGB and SHO filters are recommended. If using third-party filters, ensure the glass thickness is between 1.5 mm and 3.0 mm (with frames of approximately 1.8 mm).
Additional information
| Manufacturer | Suzhou ZWO Co., Ltd. |
|---|---|
| Manufactured in | China |
| Colour | Black |
| Warranty | 2 years |
| Filter Wheel Type | Electronic (Motorized) Filter Wheel |
|---|---|
| Filter Wheel Body Material | Aircraft-grade aluminum (black anodized) |
| Filter Capacity | 7 positions |
| Filter Size Compatibility | 36mm unmounted filters |
| Compatible Cameras | Adaptable to other cameras with T-thread adapters, ZWO ASI monochrome cameras (direct connection) |
| Compatible Filters | Unmounted 36mm filters, ZWO 36mm filters (LRGB, SHO) |
| Supported Filter Thickness | 1.5mm – 3.0mm (frame thickness ~1.8mm) |
| Motor | NPM stepper motor (Japan) |
| Rotation Direction | Bidirectional (clockwise or counterclockwise) |
| Connection Type | USB 2.0 |
| Control Method | Via USB from computer or through ZWO cooled camera’s USB hub |
| Software Compatibility | ASCOM, INDI, ZWO native drivers |
| Power Consumption | ~120mA @ 5V |
|---|---|
| Power Supply | Powered directly through USB (no external supply required) |
| Diameter | 150 mm |
|---|---|
| Thickness | 20 mm |
| Net Weight | 400 gr |
| Number of boxes | 1 |
|---|---|
| Package Contents | 1.25" cover, 1.25" eyepiece/camera holder, 1.25" nosepiece, 10 filter masks, Darkening ring, EFW body, M2*4 flat screws, Phillips screwdriver, T2–T2 male adapter, USB2.0 cable (2 m) |
Reviews
In the Box
In the Box
- ZWO electronic filter wheel (body) with 7-position filter carousel for 36mm filters
- 1.25" cover
- T2–T2 male adapter
- 1.25" nosepiece with T/T2 threads
- Phillips screwdriver and screw set (M2*4 flat screws, retaining screws)
- Filter masks (10pcs)
- 1.25" eyepiece/camera holder with T/T2 threads
- USB2.0 cable (2 m)
- Darkening rings
Darkening Rings
In order to help solve the light leaking issue occurring in the gap of the filter wheel and camera, a set of 4 darkening rings are included in the package.
Specifications for the darkening sets:
- External diameter: 88mm.
- Inner diameter: 55mm (2pcs) & 58mm (2pcs).
- Thickness: ≤0.2. 4pcs in total.
More
More
If you are using ASI2600, then directly head over to this instruction: [ASI2600 Guide] 4 Connection methods to get 55mm back focus length
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