ZWO Electronic Automatic Focuser (EAF) 5V
ZWO Electronic Automatic Focuser (EAF) 5VZWO Electronic Automatic Focuser (EAF) 5VZWO Electronic Automatic Focuser (EAF) 5V
ZWO Electronic Automatic Focuser (EAF) 5VZWO Electronic Automatic Focuser (EAF) 5VZWO Electronic Automatic Focuser (EAF) 5V

ZWO Electronic Automatic Focuser (EAF) 5V

  (20 Reviews)
✓ 2 year warranty


44x in stock shipped 1-2 working days

About this product

Model:  zwo_eaf
Part Number:  ZWO-5V-EAF

Latest version uses 5v USB for Power Supply

You can now directly connect the EAF to your camera, laptop or ASIAIR PRO via the USB 2.0 port & cable for both data transmission and power supply. This makes cable management easier and reduces power requirements.​ 

Compatible with the ASIAIR smiley

Support list:

  • SkyWatcher Astrophotography Reflectors, SkyWatcher Black Diamond, SkyWatcher Dobsonians, SkyWatcher Maksutov-Newtonians.
  • SharpStar telescopes,
  • SkyRover telescopes,
  • TS Optics,
  • Astro Tech,
  • FeatherTouch

Please be aware not all models from the brands above are supported.  

For information regarding the full supported list and connection methods please see HERE:

With an optional adapter the following Takahashi and Vixen telescope focusers are also supported:

  • Takahashi FSQ85
  • Takahashi FSQ106 (not first generation)
  • Takahashi TOA-130NFB
  • Takahashi TOA-150B
  • Vixen VC200L


  • Size: 60mm x 50mm x 40mm
  • Step motor, 35mm diameter, 7.5° step angle
  • Reduction ratio: 120
  • Data port: USB2, Type-B
  • Weight: 277g
  • Capacity: 5kg


Customer reviews

Average Rating (20 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
ZWO EAF autofocuser on Skywatcher Explorer 200P Newtonian
Friday, 30 April 2021  | 

The EAF looks and feels Quality and overall I'm very pleased with the 'tech', especially for the price. The box contains several bags of bits and pieces and 4 shaft coupling options to cater for different shaft diameters, I used the thinnest bore on the standard Skywatcher hand focuser wheel.
There are baggies of different screws and fixings, which is nice except there is no clarification as to what they are intended for? A bit of a hint and some descriptions in the instruction manual would have saved a lot of head scratching. It's a process of looking at your OTA and figuring out what needs to go where to attach. The right angle bracket is nicely made but flat, the SW (and the DC motor bracket I removed - to be replaced by..) is slightly curved but the standard (small, fiddly SW) screws are long enough and by carefully tightening each corner (there are 4) the flat EAF plate can be fixed into place.
A gripe is that this attachment plate only fits in one place due to the focus locking knob/screw and this sets the shaft to coupler to EAF distance which only just about makes it - time will tell if this is secure enough or becomes a problem.
As I didn't take the hand controller I used the ASCOM Profile utility to check the drivers were loaded and present (and remove the old focuser) , the utility fired up a simple focuser interface and I checked the in/out operation.
Just to note that the stepper motor doesn't turn by hand and there are 4 grub screws - 2 at either end of the shaft coupler - so you need to drive the motor to spin so these come to face you and can be tightened.

So, it's all attached, seems to be working but not seen 'first light' and not seen what the temperature probe does as yet but thus far very pleased and looking forward to firing it all up in The SkyX and having a play.

Would have been 5 stars for better instructions and specifics on the SW Explorer 200P

Rating (max 5):  
Thursday, 4 March 2021  | 

Feels and looks like a well build product & smartly finished case. It wasn't designed to fit my particular telescope WO Zenithstar 80 ED but with a few adjustments to the standard bracket supplied I have it very securely mounted. Easy to set up with my software, SharpCap 3.2. Very impressed with the smooth operation and repeatability of focus position. There's more to learn about it's use yet but it's already a winner as far as I'm concerned. Tempted to buy another for my larger scope that is permanently mounted in my observatory.

Rating (max 5):  
Easy to install on the Redcat 51
Monday, 18 January 2021  | 

A couple of cheese plates, a belt drive from a 3D printer, belt, and sprocket (cut to length and glue/sew into a loop £6.50 from Amazon), and it all worked fine.

Rating (max 5):  
Tuesday, 5 January 2021  | 

Took a long time to get due to Covid but a great product.
Works perfectly on an Esprit 120.

Rating (max 5):  
Focus from your warm room
Tuesday, 22 December 2020  | 

This needed some work to fit as I was fitting it to a SW80 with a Moonlite focus rail.
the bracket that it comes with needed a bit of grinding down but it's on and secure, so all happy.
Once again, solid ZWO construction. drivers off the Zwo website and works fine with NINA.

Rating (max 5):  
Great addition to my ASIAir Pro.
Friday, 11 December 2020  | 

Used on my older Explore Scientific 102mm apo it took only a couple of minutes to fit once Iíd found some bolts as the supplied were no use. The build quality is impressive. Iíve used it on several imaging sessions now and it has performed very well. Iím using the ASIAir pro and Iím getting great V curves during the focus routine and low HFD readings. The ability to set autofocus to run every 30 minutes or on filter change or after a set temperature change means I can set it going and just let things get on. No more standing in the cold with a bahtinov mask tweaking the manual focus knob! So far, so good. Letís hope it proves durable long term. As usual, service from FLO was super. I recommend you try this unit. It will make things much easier whether you use SGP, APT, N.I.N.A. Or the ASIAir.

Rating (max 5):  
Thursday, 5 November 2020  | 

These two units integrate seamlessly. I have not had to configure anything to get a working system that focuses better than I can achieve manually. Great to be able to refocus the OTA from the warmth of my study!
For a critical review on backlash etc. please look elsewhere. As it works out of the box with mu Esprit 100ED I am happy.

Rating (max 5):  
Tuesday, 13 October 2020  | 

I bought this as my 1st venture into auto focusing. It looks to be a solid, well made device. I had to get creative when fitting the bracket to my focuser. The bracket has ridges on one side, this was the side that had to face up to my focuser and it was pulling off square when I tightened it down, it would be better if the bracket didnt have these ridges and was smooth on both sides. I'd have given 5 stars were it not for this. Other than this, fitting wasnt difficult and set up was easy.

Rating (max 5):  
ZWO electronic focusser
Tuesday, 29 September 2020  | 

Well made piece of kit. Works well. Just make sure that you can rem ove the coarse focussing knob on your telescope before you buy, (for a horrible minute I thought mine would not). Good value compared to other offerings.

Rating (max 5):  
Great EAF at a good price
Wednesday, 5 August 2020  | 

I am so happy with this EAF that I bought 2. One for each telescope. The only issue I had, was that I needed to find screws that match my telescopes focusers. The screws supplied with the EAF did not fit the SkyWatcher 72ED or the Bresser Messier AR-127L. But I found some in the local store and everything works great.

Read all 20 customer reviews...


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