ZWO EFW(Electronic Filter Wheel)mini (5 x 1.25″or 5 x 31mm)

The smallest and most lightweight 1.25″ Electronic Filter Wheel in the world!

300g  ONLY ! Small than your hand !

The body is CNC machined from a full block of aircraft grade aluminium.

Very thin design, 20mm ONLY

The step motor is the heart of the EFWmini, which is made by NPM from Japan. You can trust its quality and relability.

Supports both 5*1.25″ filters or 5*31mm filters

The Electronic Filter wheel can be rotated in both counter clockwise or clockwise direction for filter selection.

Only one USB Cable is enough to power up the EFW, the max power consumption is around 120ma@5V, so you can connected it form the USB2.0 hub of our cooled cameras.

The distance between the filter and sensor is around 10mm when you connect it to ASI1600.

So 1.25″ filters won’t have vignetting up to F5 focal ratio scope and 31mm filter won’t have vigentting up to F2 lens

Our new RGBL filters are recommended to work with ASI1600, it will offer nearly 1:1:1 RGB color balance.

What`s in the box?

1. EFWmini body
2. 1.25″ cover
3. T2 nosepiece
4. 1.25″ holder(with cover and 2 screws)
5. T2-T2 adapter(male)
6. A bag of filter masks
7. USB2.0 2m cable
8. Phillips screwdriver
9. A bag of M2 screws

Mechanical drawing:

How to use it?

you use need to plugin the EFW mini with USB2.0 cable and install the   ASCOM driver

There are  ZWO Filter Wheel(1) and ZWO Filter Wheel(2) to select,  you can use either one of them

There are 2 ASCOM is for controlling 2 EFWmini in one software.