ZWO EFW 8 x 1.25″

SKU: ZWO EFW-8x1.25 Categories: , ,

The ZWO 8 x 1.25″ Electronic Filter Wheel (EFW) has 8 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:

  • 8 filter slots
  • Can accept 1.25″ threaded filters or 31mm unmounted
  • High reliable Japanese stepper motor
  • Powered by USB (suitable for powering from a ZWO cooled cameras  usb2.0 port)
  • Can be rotated in both counter clockwise or clockwise direction



$499.00 inc GST

Available Now

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The ZWO Electronic Filter Wheel 8 x 1.25″ (EFW 8×1.25″) can accept 1.25″ threaded filters.

ZWO’s latest Electronic Filter Wheel, larger than the previous but still low on weight. Only 400 grams (14 oz)!

The body is CNC milled from an aircraft graded aluminum block.
ZWO decided to make it thinner, where it measures only 20 mm on the wheel body.

The heart of our EFW comes from NPM, Japan, whose the manufactor for the stepmotor and the quality is trustful and reliable. Guaranteed long life.

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

There is no need for multiple cables to power this wheel up, just one USB cable does the trick.The power consumption of this EFW is approximately 120mAh @ 5V, which can be operated from the ZWO Cooled CCD’s USB hub.

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 vignetting 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″ thread in filters (shorter than 3mm)
or,  31mm unmounted, height maximum is 7mm
Filter slots: 8
Control Mode: ASCOM and SDK
Weight: 400 grams
Power Supply: USB
Material: Aluminium
Power Consumption: 120mAh @ 5Vdc
In the box: EFW 8×1.25″
1.25″ cover
T2 nose piece
USB2.0 cable
A bag of filter masks
Phillips screwdriver
A bag of M2*4 flat screws (23pcs/ bag)
T2 to T2 adapter male


Always check and confirm with the manufactures website for latest updated specifications.