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ZWO 1.25" Helical Focuser

SKU : ZWO-HF1.25

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  • Approximately 6 mm of travel distance.
  • The minimum height of the focuser is 48.5 mm.
  • The minimum adjustment accuracy is 0.1 mm.
  • 1.25-inch pass straight-through.

Product Details


    Main Specifications

    ZWO's 1.25-inch Helical Focuser is the perfect fit for your ZWO or other brand guiding camera. Fitting snugly in the M42x0.75 threading on either side, you can be sure in knowing how easily this focuser can be adapted into your setup. The adjustment accuracy of 0.1mm is also sure to impress any veteran astronomer.


    Reliable Craftwork

    With such durable craft, there's no fear about this accessory falling apart any time soon either. The trademark ZWO reliability will never let you down and sitting at a minimum height of 48.5 mm, you know exactly what you're getting and how to work with it.



  • specifications

    Camera/Eyepiece Side ConnectionMale M42x0.75
    Scope Side ConnectionFemale M42x0.75
  • included items

    • Approximately 6 mm of travel distance.
    • The minimum height of the focuser is 48.5 mm.
    • The minimum adjustment accuracy is 0.1 mm.
    • 1.25-inch pass straight-through.

Product Reviews

Customer Reviews
5.0 Based on 7 Reviews
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United States

Very helpful item

This focuser is the perfect length to make an ASI290MM minicam parfocal with an ASI178MC camera. So the guidescopes can be adjusted to focus the ASI178 then the ASI290 can be inserted and the focus adjusted with this focuser without disturbing the scope focus for the ASI178.

Scott D.
United States United States

This should be part of the OAG...

I would have just paid more for the OAG in the first place if it had this attached. Guiding was always a huge pain because I struggled with getting things in focus. This simplifies it so much. Highly recommend.

United States United States

Good buy

High quality part for a good price.

Greg P.
United States United States

Works great, on a not so sturdy OAG

Good. Working with my AT 102 EDL, ZWO OAG and QHY QHY5L-IIM. As good or better guiding than my old 60mmguide scope now with the OAG, just easier to focus now.

Bill C.
United States United States

A Must Have for Astrophotography Guide Scope

For me a Must Have for Guide Scope, Better Focus Better Guiding. I got one for each of my WO 50 Guide Scopes. Would like to have one with 48mm Threads as well...

OPT Telescopes ZWO 1.25 Helical Focuser Review
Jon G.
United States United States

Does the job and does it well.

Purchased to simplify focusing the guide camera in my off axis guider. Much easier to and hold precise focus with the Helical Focuser. This one is well made, easy to use and holds its position well, and the price is what I would expect. Also, I have 2 ZWO cameras and the OAG and EAF are ZWO so the color scheme matches (ZWO Red)!!! OPT service and speed of delivery perfect, as always.