T2 (M42x0.75) to 1.25" Spacer (20, 25, 30 mm)

This is a simple T2 (M42x0.75) to 1.25" extension tube designed for astrophotography setups and telescope accessories.

The spacer allows you to increase the optical distance between T2-threaded components and 1.25" accessories. It can be useful when additional backfocus or spacing is required.

Unlike many adapters, this model does not use a set screw or compression ring. The design relies on a tight friction fit, which helps avoid scratching anodized aluminum adapters such as camera T-rings.

This makes it particularly convenient for setups like:

• T2 camera adapters
• Sony E / mirrorless T-rings
• lightweight astrophotography configurations

The internal thread is M42x0.75 (T2).

Features

• T2 (M42x0.75) internal thread
• 1.25" telescope barrel
• simple lightweight design
• no set screw (scratch-free friction fit)

Typical uses

• astrophotography spacing
• telescope backfocus adjustment
• camera adapter spacing
• lightweight eyepiece extensions

Printing recommendations

• layer height: 0.16–0.2 mm
• material: PLA / PETG
• print orientation: vertical (barrel down)

Threads were tested on standard T2 camera adapters.