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