M117 to M117 Extension Tube – 50mm
The Dark Clear Skies M117 to M117 50mm Extension Tube is a precision-machined spacer designed for large-format astrophotography imaging systems requiring accurate back focus spacing.
Featuring M117×1 male threads on both ends, this extension tube is intended for use with large reducers, flatteners, camera adapters, and filter systems commonly found in professional and observatory-class imaging setups. The 50mm optical length allows reliable coarse spacing adjustments while maintaining rigidity and alignment.
Manufactured from high-quality aluminium alloy and internally blackened, the tube minimises reflections and preserves contrast when used in demanding deep-sky imaging configurations.
Key Features
- M117×1 male to M117×1 male threads
- 50mm extension length
- Designed for large-format astrophotography systems
- Precision-machined aluminium construction
- Internally blackened to reduce reflections
Specifications
- Thread Type: M117 × 1 (male to male)
- Extension Length: 50 mm
- Material: Aluminium alloy
- Application: Astrophotography back focus spacing
- Finish: Black anodised
Typical Applications
- Large-format camera imaging trains
- Back focus adjustment for reducers and flatteners
- Observatory-class telescope systems
- Rigid optical train extension
