Baader T-thread to 1.25'' Helical Focuser

Baader T-thread to 1.25" Helical Focuser

  (3 Reviews)
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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 (3 Reviews):  
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Rating (max 5):  
Perfect for Atik OAG
Friday, 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.

Rating (max 5):  
Works well
Tuesday, 25 August 2015  | 

I needed this to fit a 1.25" eyepiece to the T2 connection on my 60mm Baader Variofinder. It works smoothly and precisely.

Rating (max 5):  
Baader T-thread to 1.25 Helical Focuser
Wednesday, 8 January 2014  | 

This is an excellent piece of kit. I bought it to improve the focusing on a standard Synta style R&P rather than go to the expense of a aftermarket Crayford. It works a treat, is lightweight & doesn't add much to the optical path. Moreover, it's very well made & has a really smooth action. It does rotate but if you're only using an eyepiece in it, then it doesn't matter.


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