ZWO EFWMini Electronic Filter Wheel
The ZWO Mini Electronic Filter Wheel, or EFWMini, is amazingly small and lightweight! It weighs just 10.58 ounces (300g) and the filter wheel is super thin at only .79”, or 20mm.
The ZWO EFWMini is small enough to fit in your hand, but it is rugged. The black anodized body is CNC machined from a block of aircraft-grade aluminum, and the stepper motor is made in Japan by NPM.
The five position color filter wheel, which can rotate in either direction, accepts either 1.25” or 31mm filters, which are sold separately. With the ASI1600 camera installed, non-vignetted results are achievable with 1.25” filters and systems as fast as f/5. 31mm filters would be your choice if you have a fast system between f/4.9 and f/2.
To use the ZWO EFW Mini filter wheel, install the ASCOM driver and plug the included USB2.0 cable into the USB port on your camera. Alternately, you can connect the EFWMini via the USB cable directly to your computer.
Other included accessories are a T2 nosepiece, a Holder-T2 and T2-T2 Adapter, and a 5-position filter carousel that will accept 1.25” mounted filters or 31mm unmounted filters that can be held in place with M2 retaining screws.
The ASCOM driver is compatible with a wide range of control software.