Do you use a monochrome ASI camera and want to easily switch between LRGB or narrowband filters? Then the ZWO EFW 7x36mm II filter wheel is indispensable. This electronic filter wheel accommodates seven 36mm unframed filters and allows you to change filters fully automatically, without touching the setup.
What makes this filter wheel so special?
- No vignetting - even with larger sensors and fast f/ratios
- Only 20 mm thick - compact, light (650 grams), ideal for mobile setups
- Highly accurate stepper motor - sourced from NPM (Japan)
- Fully integrated with ASI cameras - power and control via USB
Because the filters are only 10 mm from the sensor, even the outer edges of the image remain clear and shadow-free. Ideal for deep-sky astrophotography where you work with fast optics or large image sensors.
Included accessories:
✓ USB cable
✓ Threaded adapter (M42)
✓ Filter masks
✓ Mounting tools and screws
What you can do with it
✓ Automatically switching between LRGB or narrowband filters
✓ Shooting without image shift when changing filters
✓ Compatible with all major ASI mono cameras
✓ No edge shadow, even at f/4 or faster
✓ Perfect combination with ZWO ASIAIR and EAF
Specifications
| Feature | Value |
|---|---|
| Suitable for | ZWO ASI cooled mono cameras |
| Number of filters | 7 pieces |
| Filter size | 36 mm unsummarized |
| Telescope connection | M42 |
| Optical length | 20 mm |
| Control | USB 2.0 (no external power required) |
| Weight | approx. 600 grams |
| Material | Aluminum (CNC machined) |
| Series | EFW |
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