ZWO EFW - 8 x 1.25" or 31mm

Slim and Sturdy Design

CNC-milled from aircraft-grade aluminum for durability.

Ultra-thin design with a body thickness of just 20 mm, ensuring portability and easy integration into your astrophotography setup.

High-Quality Stepper Motor

Powered by a reliable NPM stepper motor from Japan, ensuring long-lasting performance and smooth, precise filter rotation.

Efficient Power Usage

Operates with a single USB cable for both power and control.

Power consumption is approximately 120mAh @ 5V, allowing operation directly through the USB hub of a Cooled ASI Camera.

Filter Compatibility

1.25″ filters: No vignetting with telescopes up to an f/5 focal ratio.

31mm filters: No vignetting with lenses up to f/2.

Installation Instructions - For 1.25" Filters

1. Ensure filters are threaded (length < 3mm) or unthreaded (height < 7mm).
2. Remove the back cover of the EFW.
3. Lay the wheel flat and screw in the filters.
4. Reattach the back cover.

Installation Instructions - For 31mm Filters

1. Use the included M2 screws and washers.
2. Remove the back cover and lay the wheel flat.
3. Carefully place filters into the designated recesses.
4. Attach washers and secure with screws.
5. Reattach the back cover.

Ease of Use

1. Connect the EFW via the included USB 2.0 cable.
2. Install the ASCOM driver to begin operation.
3. Control the EFW via ZWO Filter Wheel (1) or ZWO Filter Wheel (2), allowing simultaneous control of two EFWs within compatible software.