The ZWO 1.25" Helical Focuser works great with the ZWO OAG and ASI Mini Series cameras, but can also be used for exact focus requirements with other set-ups.  Both ends of the helical focuser have M42x0.75 threads; the top threads are Male and the bottom threads are Female.

This diminutive helical focuser is CNC machined from an aluminum alloy material used in aerospace.  It is then frosted and anodized for beauty and long life.  

Specifications

• Inner Diameter:  1.25"
  
• Stroke:  6 mm
  
• Adjustment Accuracy:  0.1 mm
  
• Top Thread:  Male M42x0.75
  
• Bottom Thread:  Female M42x0.75
  
• Minimum Height:  48.5 mm
  
• Weight:  80-100 g
  
• Focusing Tolerance:  +/- 0.3 mm