SVBONY SV109 Variable M42×0.75 (T2) Extension Tube is a precision spacing adapter designed for astrophotography imaging trains. With an adjustable extension range of 24–35 mm, it allows fine control of back focus when using cameras, reducers, or field flatteners.

Key Features

• All-metal anodised construction
  Manufactured from aluminium alloy with an anodised finish for durability, rigidity, and long-term reliability.
• Variable 24–35 mm extension range
  Adjustable design allows precise spacing to meet the back-focus requirements of different optical accessories.
• M42×0.75 (T2) threads on both sides
  Male and female T2 threads ensure compatibility with a wide range of astrophotography cameras, adapters, and accessories.
• Improved focus and spacing control
  Enables fine adjustment of the optical train to achieve sharp focus and correct image scale.
• Versatile imaging compatibility
  Suitable for use with cameras, filter holders, and other M42-threaded telescope accessories.

Design & Adjustment

The SV109 features a smooth, adjustable body that allows incremental length changes without introducing tilt or instability. This makes it particularly useful when fine-tuning spacing for reducers or flatteners.