Bresser Extension 25 mm 2.5″ Hexafoc M68

Bresser Extension 25 mm 2.5″ Hexafoc M68 is a precision ring that ensures the correct distance between your eyepiece or camera and the focuser. This extension sleeve is used when a telescope cannot focus because the optical distance is too short, or when the correct backfocus needs to be achieved in astrophotography.

The adapter has on both sides M68 thread, which makes it directly compatible with the Hexafoc 2.5″ focuser of Bresser telescopes. The robust aluminum design ensures a stable connection without tilt, crucial for photography with long focal lengths.

In addition to being used as an extender, the ring can also serve as a fine adjustment ring, for example in cameras or filter wheels where the exact sensor distance determines image sharpness. Thanks to its precise finish, the sleeve fits seamlessly with other M68 components.

Application
The Bresser Extension 25mm 2.5″ Hexafoc M68 is ideal for:

• Achieving the correct focusing distance with cameras or eyepieces
• Correct backfocus in astrophotography
• Stability between focuser, filter wheel and camera
• Fine-tuning the optical distance in Hexafoc systems

Indispensable for astrophotographers who work with fixed adapters and want to maintain a precisely corrected optical path.

Specifications
Type: Adapter / extension piece
Design: Extension Ring
Optical length: 25 mm
Telescope side connection: M68
Camera/accessory side connection: M68
Material: Aluminum
Diameter: 70 mm
Length: 30 mm
Weight: lightweight construction
Compatibility: Bresser Hexafoc 2.5″ focuser