Baader 1.25'' / T2 Helical Focuser

Baader 1.25" / T2 Helical Focuser

  (12 Reviews)
✓ 2 year warranty


8x in stock shipped 1-2 working days

About this product

Model:  baader-2458125
Part Number:  2458125

Precise helical focuser screws onto a male T-thread and accepts 1.25-inch fitting eyepieces and accessories.

An excellent choice for fitting a guide cameras to an Off Axis Guider with a T-thread. 


  • 6mm focus travel.
  • Optical depth ranges from 28mm to 34mm.
  • Brass compression ring with three thumbscrews for a secure fit without marring.
  • Very precise, one turn gives just 4mm of focus travel.

Note: Helical focusers rotate, this needs to be be considered when used with cameras.

Customer reviews

Average Rating (12 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Preparing for the Future
08 March 2024  | 

I purchased this item getting prepared for future modification of the Finder scope into a Guiding scope.

Rating (max 5):  
Baader 1.25" / T2 Helical Focuser
14 October 2023  | 

Purchased this to go with the Baader Flipmirror2 so as to attach the Baader Polaris2 F25
these items fit so well together, the only piece I needed to add was a short spacer to get eyepiece and imaging camera at the same focus
the focus travel (6mm I think) was more than enough to meet the various focal ranges
Another good item from Baader
Highly recommended
as said before, thanks FLO for your advice and speedy delivery - 5star too

Rating (max 5):  
Paid for Friday, delivered Saturday
30 September 2023  | 

Got this Baader focusing eyepiece holder to fit to a Baader prism diagonal for a finder scope project. Looks well smart but I also have a side mounted Sky Max 127 Maksutov and those mirror moving focusers they have are not as easy to focus as with Newtonian's or refractors. Needless to say I'll be getting another one of those Baader's again soon for the mak as you only need to get close enough with the OTA focuser and the Baader EP focuser will do the rest. Despite some other competitors offering even slightly cheaper prices then I will always use FLO initially because of their excellent customer service and fast delivery. 💯% top notch 😁👍

Rating (max 5):  
14 September 2023  | 

Ideal for my ZWO OAG fine tune the focus for guide stars

Rating (max 5):  
Convenient Fine Focus.
13 July 2023  | 

I bought this for attachment to my Badder BBHS 1.25" star diagonal. It is a reliable fit for my eyepiece and for extra fine tuning for focus.

Rating (max 5):  
Exactly what I needed
05 November 2021  | 

Perfect low cost enhancement to a Nexstar 130SLT. The focuser on the Nexstar is extremely coarse and hugely difficult to get a clear image at high magnification, but this makes it a breeze. Additionally, it replaces like-for-like the 1.25" eyepiece clamp and screws onto the Celestron supplied adapter, giving you a compression band clamp instead of the basic 2 screw holder supplied as standard. Fast delivery as well, so there's nothing not to like!

Rating (max 5):  
Quite pricey but worth it
22 September 2021  | 

Great little focuser / 1.25" holder. Fitted to the T2 prism diagonal and then into the Celestron C6. Provides a better fine focus than the standard SCT focuser.
Usual excellent Baader build quality. Something very satisfying with even the way the locking screws work. Its just a beautifully executed piece of kit.

Rating (max 5):  
Good quality focuser
05 March 2021  | 

Well made as expected. Bought it to go with Baader flip mirror. I plan to use eyepiece and camera so focused will allow me to set u both as parfocal. Worked well in my garden in daylight. Roll on a clear nigh
FLO service as always A1

Rating (max 5):  
Excellent little product
29 April 2020  | 

This is a very useful and cost effective helical focuser which I bought to provide fine focus on a Zeiss Telementor II. The Zeiss focuser is perfectly useable but a only single speed and a little stiff in places. I fitted the Baader Helical focuser to a Baader Zeiss T2 Prism and now can coarse focus with the main focuser and fine tune by turning the eyepiece. The fact that it rotates when adjusting is not an issue for visual use with an eyepiece, so it is an excellent solution which doesn’t take any additional inwards focus. You can lock it in position if needed, and also use the most conveniently placed thumb screw to make fine adjustments. Finally it has a compression ring so won’t damage your eyepiece barrel. Excellent little product.

Rating (max 5):  
Perfect for Atik OAG
27 April 2018  | 

This focuser is ideal if you are using a SX Lodestar with the Atik OAG. It provides the means to obtain the correct back focus distance, which is difficult to achieve by other means.

The build quality is very good, with a high quality black anodised surface, and the thumb screws work against the brass compression ring to provide a very secure fixing for the camera, but with no damage.

Threads are nicely cut, as is the case with most Baader equipment, so screwing on and tightening feels robust.

This has been a great solution to a problem and is highly recommended.

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