The Svbony M42 (T2) Extension Tube Set – 5mm, 10mm, and 30mm is a precision-machined spacing solution designed to help astrophotographers achieve accurate back focus in camera and imaging train setups. These T2 extension tubes are ideal for fine-tuning sensor distance when using astro cameras, filter wheels, reducers, flatteners, or off-axis guiders.

Accurate back-focus spacing

Correct back focus is critical for achieving sharp stars and optimal field correction. This extension tube set allows you to add 5mm, 10mm, or 30mm of spacing — individually or combined — giving you flexibility to match manufacturer-specified back-focus requirements without guesswork.

Standard M42 × 0.75 (T2) threading

Each tube features industry-standard M42 × 0.75 T-thread connections, ensuring broad compatibility with astrophotography cameras, adapters, filter wheels, and optical accessories commonly used in deep-sky imaging.

Precision-machined aluminium construction

Manufactured from anodised aluminium, these extension tubes offer solid mechanical alignment while remaining lightweight. The matte black internal finish helps suppress internal reflections, supporting improved contrast and reduced stray light during long exposures.

Modular and versatile design

The three included spacers can be used individually or stacked together, allowing multiple spacing combinations to suit a wide range of imaging configurations. This makes the set suitable for both beginner and advanced astrophotography setups.

Typical applications

• Adjusting back focus for field flatteners or reducers
• Spacing astro cameras and filter wheels
• Fine-tuning optical train length
• General M42 / T2 astrophotography setups

Technical specifications

Package includes

• 1 × 5mm M42 (T2) extension tube
• 1 × 10mm M42 (T2) extension tube
• 1 × 30mm M42 (T2) extension tube