ZWO EFW 7×2 inch filter wheel for ASI Mono cameras

The ZWO EFW 7×2 inch filter wheel is a precision tool for astrophotographers working with mono cameras such as the ASI 6200MM Pro. With room for seven 2-inch filters, this filter wheel offers maximum flexibility for complex shooting schemes such as LRGB, Ha, OIII and SII - all without manual changing.

Key benefits
✓ Space for seven 2-inch filters - ideal for LRGB + narrowband workflows
✓ No vignetting, even with full-frame sensors and fast optics
✓ Only 20 mm thick - compact and light (about 650 grams)
✓ Silent, precise stepper motor from NPM
✓ Low power consumption via USB - no external power supply required
✓ Suitable for both mounted 2 inch and 50.4 mm unmounted filters

What makes this filter wheel special
With seven positions for 2-inch filters (or 50.4 mm unmounted), this filter wheel is ideal for those who want to use a complete set of color AND line filters without concessions. Think LRGB combined with Ha, OIII and SII for full narrowband coverage. The compact design of only 20 mm thick makes this possible without unnecessarily extending your optical train.

The built-in stepper motor from Japanese manufacturer NPM ensures noiseless, high-precision filter changes. This prevents alignment problems and ensures that your filters stay exactly in position. Everything is controlled via a single USB cable - so no extra power supplies or separate boxes.

Compatibility and connections
The wheel connects seamlessly to mono cameras such as the ZWO ASI 6200MM Pro, with internal thread for M54, M48 and T2. This allows you to easily integrate it into almost any setup. Thanks to the large internal filter size, there is no vignetting even when used with full-frame sensors or telescopes with a fast aperture ratio.

Assembly and delivery
The filter wheel can be screwed directly to the camera. ZWO provides a clear manual with assembly instructions. You will receive everything you need:

- USB cable
- Filter masks
- Threaded adapters
- Fastening screws
- Screwdriver

Technical specifications (practically translated)
Number of filters: 7 x 2 inches mounted or 50.4 mm unmounted
Housing thickness: 20 mm
Weight: approximately 650 grams
Material: CNC-machined aluminum
Motor: Stepper motor from NPM
Power supply: USB 2.0 (low power consumption)
Connections telescope side: M54x0.75 / M48x0.75 / T2 (internal)
Suitable for: ASI 6200MM Pro and similar mono cameras from ZWO

Application in practice
Ideal for serious astrophotographers who want to switch between multiple filter sets in a single session without interruption. Perfect for narrowband imaging, LRGB projects or multispectral photometry. Combines seamlessly with ZWO's cameras, ASIAIR and OAG modules.