SKU: ZWO EFW-MINI Categories: , ,

The ZWO Mini Electronic Filter Wheel (EFW) is the smallest lightest filter wheel from ZWO, weighing only 300grams. It has 5 filter slots, accepting 1.25 inch threaded filters.

The materials have excellent craftsmanship, cnc made from aircraft aluminium, in the heart of the wheel is a Japanese high quality stepper motor which can drive the filter wheels from USB power, either in a clockwise or anti clockwise direction.

Key features:

  • 5 filter slots
  • Can accept 1.25″ threaded filters or 31mm unmounted
  • Highly reliable Japanese stepper motor
  • Can rotate clock wise or counter clock wise
  • Powered by USB (suitable for powering from a ZWO cooled cameras  usb2.0 port)




$289.00 inc GST

Contact Us For Stock Availability

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The ZWO Electronic Filter Wheel Mini (EFW Mini)

The smallest and most lightweight 1.25″ Electronic Filter Wheel in the world, only 300 grams.

The body is CNC machined from a full block of aircraft grade aluminium and is a very thin 20mm thick.

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 and 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.



Filter size: 1.25″ threaded filters
or, 31mm unmounted can be used
Filter slots: 5
Control Mode: ASCOM and SDK
Weight: 300 grams
Power Supply: USB
Material: Aluminium
Power Consumption: 120mAh @ 5Vdc
In the box: EFW Mini

1.25″ cover

T2 nose piece
USB2.0 cable, 2m length
T2-T2 adapter
A bag of filter masks for 50mm filters (7pcs/ bag)
Phillips screwdriver
A bag of M2*4 flat screws (23pcs/ bag)