Baader M68 Extension Tube – 100 mm

Baader M68 Extension Tube – 100 mm

Description
The Baader Planetarium M68 – 100 mm extension tube is a precision-engineered mechanical component for professional optical configurations requiring a large backfocus increase. In demanding astrophotography and spectroscopy applications, any mechanical flexure or tilt in the optical train can severely compromise image quality and data reliability.

This issue becomes more critical when using long and heavy accessories such as telecentric systems or the Fluorite Flatfield Converter (FFC). Their length acts as a lever on the focuser, and even with high-quality brass compression rings, a tilt can occur, affecting optical alignment.

By adopting the M68 x 1 thread, derived from the Zeiss high-end optical systems standard, this extension tube ensures a wide, stable, and tilt-free screw coupling. It is machined from high-grade aluminium and features a fully blackened internal surface to suppress stray light, thus maintaining maximum image contrast.

With its 100 mm optical length, it is ideal for:

• Adjusting backfocus in complex optical setups

• Using an FFC for high-magnification planetary imaging

• Integrating a telecentric system with H-alpha filters for solar observation

• Maintaining full compatibility with M68 and Zeiss threaded accessories

It can be used alone or combined with other M68 extension tubes to achieve the exact required spacing. As part of the Baader M68 system, it also connects via optional adapters to standards like 2.7" Astro Physics, M60 Vixen, and M56 Synta.

Its robust mechanical design ensures maximum stability even with heavy loads, meeting the requirements of professional use.

Technical specifications

• Manufacturer: Baader Planetarium

• SKU: 2458210

• EAN code: 4047825009920

• Adapter family: M68 system

• Optical length: 100 mm

• Telescope-side external thread: M68 x 1

• Accessory-side internal thread: M68 x 1

• Clear aperture: 62 mm

• Outer diameter: 76 mm

• Weight: 0.17 kg

• Material: precision-machined aluminium

• Internal finish: matte black anti-reflective coating

• Usage: extension for eyepiece projection or FFC

• Compatibility: Baader M68 and Zeiss systems