ZWO EFW Mini 5×1.25 inch filter wheel is an ultra-compact motorized wheel for astrophotographers working with mono cameras and 1.25 inch filters. Thanks to its lightweight design, quiet stepper motor, and minimal distance between filter and sensor, you can quickly and precisely change filters without touching your camera or losing focus.
The filters are positioned just 10mm from the sensor, preventing vignetting – even with fast telescopes with an f-ratio of 2. This makes the EFW Mini ideal for LRGB imaging, narrowband work, or photometry in a mobile or compact setup.
The filter wheel is directly controlled via a USB 2.0 connection, without separate power supply. The connection on both sides is T2 (M42x0.75), and a 1.25 inch adapter is included for alternative mounting.
Key benefits
✓ For 5 x 1.25 inch or 31mm filters
✓ Only 10mm distance between filter and sensor – no vignetting
✓ Lightweight aluminum housing, only 300 grams
✓ Compact: only 20mm thick
✓ Silent stepper motor for precise filter changes
✓ USB-powered, no external power supply needed
✓ Works seamlessly with ZWO ASI mono cameras and ASIAIR
Practical application
The EFW Mini is perfect for astrophotographers who want flexibility without compromising on precision. Ideal for automatically switching between filters during sessions while maintaining focus. Due to its compact size and low weight, this filter wheel is also excellent for mobile setups or use on lighter mounts.
Technical specifications
Number of filters: 5 x 1.25 inch mounted or 31mm unmounted
Housing: Aluminum, CNC-machined
Thickness: 20mm
Filter distance to sensor: 10mm
Weight: 300 grams
Connections: T2 (M42x0.75), including 1.25 inch adapter
Motor: Stepper motor
Power: USB 2.0 (150 mA consumption)
Compatibility: ZWO ASI mono cameras, ASIAIR
Included
– USB cable
– 1.25 inch adapter
– Adapter rings
– Screw set and screwdriver
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