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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Baader M68 Extension Tube - 100mm

Baader M68 Extension Tube - 100mm

by Baader Planetarium
SKU BAA-2458210
$145.00 - $145.00
$145.00
$145.00 - $145.00
$145.00
Price Match Policy!
  • Provides a fixed 100mm extension length
  • Connects via the robust M68 thread standard
  • Eliminates tilt and flexure common in heavy imaging trains
  • Functions as a light shield to block stray light
  • Internally blackened to maximize image contrast
  • Integral component of the Baader M68 Tele-Compendium system
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  • Description
  • FAQ
  • Specifications
  • In the Box
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  • Warranty

  • Baader M68 Extension Tube - 100mm

    The Baader M68 Extension Tube provides a rock-solid 100mm of extension for heavy imaging trains, replacing standard compression fittings with a large M68 threaded connection. This M68 extension is a core component of Baader's Tele-Compendium system, designed to achieve precise 100mm spacing without introducing tilt or flexure.

    The 100mm Solution to Imaging Train Flexure

    For professional-level astrophotography, any amount of flexure in the optical train can render an image unusable. The Baader M68 Extension Tube - 100mm directly addresses this by creating a rigid, threaded connection that will not sag or tilt under the load of heavy cameras, telecentric systems, or other long accessories. Based on the M68 thread standard used on large Zeiss telescopes, this system provides a far more secure attachment than simple slip-fit adapters.

    Modular Spacing and Stray Light Control with the M68 System

    This 100mm tube is a fundamental part of the Baader M68 Tele-Compendium, a modular system designed for building custom, high-rigidity optical paths. You can combine this tube with other M68 components to achieve the exact spacing your setup requires. In addition to providing structural integrity, the tube's interior is fully blackened and acts as an effective light shield, blocking stray light from entering the optical path and reducing image contrast.

  • Why use the Baader M68 100mm Extension Tube instead of a standard 2" extension?

    A standard 2" extension with a compression ring or thumbscrew is prone to tilt, especially with a long or heavy accessory load. The Baader M68 100mm Extension Tube uses a large-diameter thread for a direct, rigid connection that completely eliminates this flexure, ensuring your camera sensor remains perfectly orthogonal to the optical axis.

    What is the Baader M68 Tele-Compendium system this 100mm tube belongs to?

    The M68 Tele-Compendium is a modular system of extension tubes, adapters, and focusers all based on the robust M68 thread. It allows you to build a completely rigid, threaded optical train of nearly any length, tailored to the specific backfocus requirements of your camera and accessories.

    I'm using a Telecentric System for H-alpha solar imaging. Will the Baader M68 100mm Extension Tube prevent tilt?

    Yes, absolutely. Telecentric systems are often long and can exert significant leverage on a focuser, making them a prime candidate for tilt-induced issues. Using the Baader M68 100mm Extension Tube as part of your imaging train provides the rigid, threaded support needed to keep the entire telecentric assembly perfectly aligned for high-contrast solar imaging.

    How does the Baader M68 100mm tube help when imaging planets with a heavy Fluorite Flatfield Converter (FFC) and camera?

    A Baader FFC combined with a planetary camera creates a long, heavy imaging train that is very susceptible to flexure. The Baader M68 100mm Extension Tube provides a secure, threaded pathway that supports this weight without sagging. This ensures the planetary image remains centered and sharp across the sensor, which is critical for high-resolution work on targets like Jupiter or Saturn.

    Can I stack multiple Baader M68 extension tubes?

    Yes. The entire M68 system is designed for modularity. You can thread multiple Baader M68 extension tubes of different lengths together to achieve precise, custom spacing for your specific optical setup while maintaining a rigid, flex-free connection from the focuser to the camera.

    Does the Baader M68 100mm Extension Tube help reduce stray light?

    Yes. It serves a dual purpose as a rigid spacer and a light shield. Its length and carefully blackened interior walls act as a baffle, preventing off-axis stray light from reaching your sensor and improving the overall contrast of your images.

  • Part Description M68 Extension Tube, 100mm Long
    Thread System Baader M68
    Extension Length 100mm
    Net weight (kg) 0.17
    Compatible Brands Baader Planetarium, Zeiss
    Inner Diameter / Clear Aperture (mm) 62
    Outer Diameter 76
    Usage serves as additional focus distance for eyepiece projection or FFC
    Inner Connection (eyepiece/-camera-sided) M68 x 1
    Outer Connection (lens sided) M68 x 1

    • Baader M68 Extension Tube - 100mm

      × 1

  • No product-specific manual or software is available for this component.

  • Baader Planetarium Warranty