Baader T-thread to 1.25" Helical Focuser

Baader T-thread to 1.25'' Helical Focuser


In stock - Shipped 1-2 working days.

Model:  baader-2458125
Part Number:  2458125
Brand:  Baader

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.

There are currently no specifications available for this product.

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Average Rating (2 Reviews):  
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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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