Using a monochrome ASI camera and want to easily switch between LRGB or narrowband filters? Then the ZWO EFW 7x36mm II filter wheel is essential. This electronic filter wheel accommodates seven 36 mm unmounted filters and enables fully automatic filter changes without touching your setup.
What makes this filter wheel special?
- No vignetting – even with larger sensors and fast f-ratios
- Only 20 mm thick – compact, light (650 grams), ideal for mobile setups
- Highly precise stepper motor – sourced from NPM (Japan)
- Fully integrated with ASI cameras – power and control via USB
With filters positioned just 10 mm from the sensor, even the outer edges of the image remain bright and shadow-free. Perfect for deep-sky astrophotography when working with fast optics or large image sensors.
Included accessories:
✓ USB cable
✓ Thread adapter (M42)
✓ Filter masks
✓ Mounting tools and screws
What You Can Do with It
✓ Automatically switch between LRGB or narrowband filters
✓ Photograph without image shift during filter changes
✓ Compatible with all major ASI mono cameras
✓ No edge shadowing, even at f/4 or faster
✓ Perfect combination with ZWO ASIAIR and EAF
Specifications
| Property | Value |
|---|---|
| Suitable for | ZWO ASI cooled mono cameras |
| Number of filters | 7 pieces |
| Filter size | 36 mm unmounted |
| Telescope connection | M42 |
| Optical length | 20 mm |
| Control | USB 2.0 (no external power needed) |
| Weight | approx. 600 grams |
| Material | Aluminum (CNC-machined) |
| Series | EFW |
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