ZWO Electronic Automatic Focuser (EAF)
ZWO Electronic Automatic Focuser (EAF)ZWO Electronic Automatic Focuser (EAF)ZWO Electronic Automatic Focuser (EAF)
ZWO Electronic Automatic Focuser (EAF)ZWO Electronic Automatic Focuser (EAF)

ZWO Electronic Automatic Focuser (EAF)

  (9 Reviews)
✓ 2 year warranty


Usually shipped 7-10 working days.
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About this product

Model:  zwo_eaf
Part Number:  ZWO-EAF-S

New ASCOM compliant auto-focuser for your telescope.

Introducing the new EAF, the latest innovation from ZWO. This electronic focuser enables precise, dynamic focus control for your imaging.

Available in two versions, a standard version with the EAF, flexible coupling, motor bracket and USB 2 cable and an advanced version which also includes a hand controller and temperature sensor. The Advanced version is due for release in August 2019.

Compatible with the ASIAIR.

A wide range of adaptors are under development - currently supported focusers include:

  • SkyWatcher Astrophotography Reflectors, SkyWatcher Black Diamond, SkyWatcher Dobsonians, SkyWatcher Maksutov-Newtonians.
  • Feather Touch
  • SkyRover, SharpStar, TS Optics and Astro Tech

With an optional adapter the following Takahashi and Skywatcher Esprit telescope focusers are supported:


  • Takahashi FSQ85
  • Takahashi FSQ106
  • Takahashi TOA-130NFB
  • Takahashi TOA-150B
  • Vixen VC200L


  • Size: 60mm x 50mm x 40mm
  • Power port: 12v DC 5.5mm x 2.1mm, centre positive
  • Step motor, 35mm diameter, 5760 steps to rotate a circle
  • Data port: USB2
  • Weight: 277g
  • Capacity: 5kg


Mechanical Diagram

Whats in the box..

Customer reviews

Average Rating (9 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Excellent addition to my setup
Tuesday, 7 July 2020  | 

Purchased this to fit my Skywatcher Evostar 80ED. It works seamlessly with my ZWO ASIAir Pro - can highly recommend. This is a massive improvement and glad I made the purchase. I had a few problems attaching it to the focuser, but FLO helped me out and provided prompt and first class service as always. I ended up attaching this to the left and right screw holes (next to the centre tension screw hole) using M3 15mm bolts - be careful not to put too much tension on the focus tube though. I am truly impressed with the after sales service that FLO provide.

Rating (max 5):  
Easy to fit
Monday, 6 July 2020  | 

Have attached to my William Optics ZenithStar 73. Fittings needed were included in the standard pack and were simple to apply. Hand controller worked without a hitch and temperature sensor works fine too. Will be configuring and controlling this using the excellent N.I.N.A software suite.

Rating (max 5):  
ZWO EAF Focuser
Tuesday, 26 May 2020  | 

Got it to fit my Explore Scientific 80mm triplet. Needs longer bolts (Try M4 20mm or 25mm with washers) Massive improvement over manual focusing.

Rating (max 5):  
Excellent kit
Tuesday, 7 April 2020  | 

I only docked a star because none of the included screws fit my 130PDS focuser and I had to buy more. Other than that it wasn't much fuss to fit and it works a treat. I use it with APT and focusing is now a breeze.

Rating (max 5):  
ZWO EAF - Brilliant
Friday, 6 March 2020  | 

Compatible with lots of different focusers, easy to install on the ED72 and a GSO SCT (my testing so far) with many attachment options included. extremely good fine control, tested with Nina and Ascom. So good I bought a 2nd one.

Rating (max 5):  
Great experience
Tuesday, 4 February 2020  | 

I bought this along with some other equipment after an online discussion with FLO. They responded very quickly and efficiently to my questions and once this (along with three other items) was ordered it arrived very quickly and was packaged very securely. Would recommend FLO with no problem

Rating (max 5):  
Works well
Monday, 9 December 2019  | 

Seems to work well with SGP and my WO73. It consistently produces excellent focus and fitting was easy. I will be adding them to my other OTA's in time.

Rating (max 5):  
Tuesday, 29 October 2019  | 

Nice little focuser easy to attach to the scope and easy to operate via the ASiair controller. If you want to automate your system then this is ideal. Thanks FLO for a speedy delivery.

Rating (max 5):  
Wednesday, 2 October 2019  | 

Bought this back in July, fitted with no problem to a William Optics GT71.
Works perfectly well and was the ideal solution to focusing for me.


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Related Products
ZWO Hand Controller for EAF
ZWO Takahashi Bracket for EAF

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