ZWO Mini Electronic Filter Wheel  (EFW) - 5 x 1.25″ or 5 x 31mm
ZWO Mini Electronic Filter Wheel  (EFW) - 5 x 1.25″ or 5 x 31mmZWO Mini Electronic Filter Wheel  (EFW) - 5 x 1.25″ or 5 x 31mmZWO Mini Electronic Filter Wheel  (EFW) - 5 x 1.25″ or 5 x 31mm
ZWO Mini Electronic Filter Wheel  (EFW) - 5 x 1.25″ or 5 x 31mmZWO Mini Electronic Filter Wheel  (EFW) - 5 x 1.25″ or 5 x 31mmZWO Mini Electronic Filter Wheel  (EFW) - 5 x 1.25″ or 5 x 31mm

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

  (8 Reviews)
✓ 2 year warranty


7x in stock shipped 1-2 working days

About this product

Model:  zwo_efw_mini
Part Number:  ZWO-EFW-MINI

The smallest and most lightweight 1.25" electronic filter wheel available. Only 300g!


  • Supports 5x 1.25" mounted filters or 5x 31mm unmounted filters.
  • Stepper motor made by NPM from Japan - quality and reliability you can trust.
  • Rotates in both directions for faster filter selection
  • CNC machined body from a full block of aircraft grade aluminium enabling a very thin 20mm design.
  • Powered by USB - max consumption around 150ma@5v
  • ASCOM driver

Filter to sensor distance when connected to the ASI1600 is around 10mm, you can use 1.25" filters without vignetting up to f/5 or 31mm filters up to f/2.

Includes M2 screws and washers required for fixing unmounted 31mm filters.

Important Note: 1.25" filters require threads shorter than 3mm and the height without threads must be less than 7mm.

Camera in picture not included ;-) The short USB cable pictured is supplied with the ASI1600 cameras with USB hubs.

Mechanical Drawing

What's in the box

  • EFWmini Body
  • T2 Nosepiece
  • 1.25" Holder to T2
  • T2-T2
  • USB2.0 Cable
  • M2 Screws & Washers for 31mm Filters

Downloads / Manuals

The following manuals and downloads are available for this product:


ZWO Software and Drivers


Customer reviews

Average Rating (8 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Zwo Mini Electronic Filter wheel
Sunday, 8 November 2020  | 

Great product, absolutely silent and smooth operation, fair price and fast delivery by First light optics to germany. Many thanks!

Rating (max 5):  
ZWO Mini Filter Wheel
Monday, 13 July 2020  | 

Bought this to use with Optolong and ZWO filters together with my ASI1294MC Pro .
Really excellent filter wheel and would highly recommend it.

Rating (max 5):  
Great value for money.
Sunday, 7 June 2020  | 

It's hard to get something as good for this money. Very good build quality and works perfectly with my ASIAIR. Highly recommended.

Rating (max 5):  
Solid piece of kit
Monday, 25 May 2020  | 

Pretty solid piece of kit. Does exactly what it says on the tin. Price is a bonus. Iíve this attached to an ASI 1600MM and a ZWO OAG. All fits together nicely and worked straight out of the box.

Rating (max 5):  
Well made and good accessories
Tuesday, 28 April 2020  | 

Very solid build quality and comes complete with various extras such as thread adaptors and washers/screws for unmounted filters etc. Even a screwdriver! Small and quite light. Fits nicely with my 1600mm cool. Usual great service from FLO. Very happy customer.

Rating (max 5):  
Tuesday, 5 March 2019  | 

This Filterable proved an Ideal replacement for my old Atik Unit. I could not get a driver to install. Even Atik support had no solution. Perhaps Windows 10 could not accommodate the device.
However, the ZWO was a joy to install, it took about five minutes, and job done.
The price was pleasing too, I only needed a 5 filter one, and this little fellow suited both my requirement, and my wallet.
Thanks to FirstLightOptics too for a great service too.
Staff always ready to advise.

Rating (max 5):  
Good quality product
Wednesday, 13 February 2019  | 

The filter wheel is perfect for narrowband filters, very smooth on the filters switch, and very well done !. Very solid aluminum, ! the only problem is! , if same filters have more them 3mm high , the filter wheel will donít work becouse the filters wheel will be stuck and do not change filters , in my case : I buy from China a UHC for my small light aberration, was a nice filter but dint fit , , my new choice was Astronomik filters and perfect choice , Ps: ty FLO and crew for the advices and support ,

Rating (max 5):  
ZWO Mini EFW Simplicity
Wednesday, 31 January 2018  | 

The aim was to get a smaller more compact and lighter FW for a protable setup. As always, FLO gave great advice and even pulled out all the stops to get my order out right at the last min for next day delivery.

Easy to setup. Comes with a T2-T2 male to male adaptor to connect non ZWO cameras. Downloaded the ASCOM driver and it was recognized immediately. I was up and working in a matter of mins.

For those who want a small lightweight EFW, then i would certainly recommend this.


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