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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.
Baader Adapter - M68x1(F)/AP 2.7"(F)

Baader Adapter - M68x1(F)/AP 2.7"(F)

by Baader Planetarium
SKU BAA-2458221
$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00
Price Match Policy!
  • Connects Baader M68x1 threaded accessories to Astro-Physics 2.7" focusers
  • Features M68x1 male (external) threads
  • Features Astro-Physics 2.7" female (internal) threads
  • Precision-machined for a secure, no-flex connection
  • Maintains optical alignment between heavy components
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader Adapter - M68x1(F)/AP 2.7"(F)

    The Baader M68 to AP 2.7" Adapter provides the critical mechanical link between the extensive Baader M68x1 accessory ecosystem and focusers using the Astro-Physics 2.7" male thread. This component features M68x1 male (external) threads on one side and Astro-Physics 2.7" female (internal) threads on the other, creating a rigid, zero-flexure bridge for heavy imaging trains.

    Securely Link M68x1 Accessories to Astro-Physics 2.7" Focusers

    This adapter solves a common compatibility challenge for imagers with high-end equipment. It allows you to securely attach Baader M68 components—such as off-axis guiders, filter wheels, or coma correctors—directly to the robust drawtube of an Astro-Physics 2.7" focuser. The precision threading ensures perfect centration and alignment, preventing tilt that can compromise image quality with large sensors.

    Integrating into the Baader M68 System

    The M68x1 thread standard is the backbone of Baader's modular system for large-format imaging, chosen for its strength and large clear aperture. By converting the Astro-Physics 2.7" thread to this standard, you gain access to a wide array of interlocking components designed to build a rigid and versatile optical train. This adapter is the key to integrating your Astro-Physics focuser into that system without compromise.

  • What specific connection does the Baader M68 / AP 2.7" adapter make?

    This adapter has M68x1 male (external) threads and Astro-Physics 2.7" female (internal) threads. It is designed to thread onto a male AP 2.7" focuser drawtube, presenting male M68x1 threads to accept a Baader M68 accessory with female threads.

    How would I use this Baader adapter to connect a Baader MPCC III to my Astro-Physics focuser?

    You would first thread this adapter onto the male 2.7" threads of your Astro-Physics focuser. This converts the focuser's output to an M68x1 male thread. You can then attach any Baader component with a corresponding M68x1 female thread, such as the Baader M68 Off-Axis Guider or other adapters leading to your MPCC III Coma Corrector.

    How much optical path length does this M68 adapter add?

    While the exact optical path length is not specified, all adapters add some length to the imaging train. It is crucial to account for this addition when calculating your back focus distance, especially when using reducers or correctors with strict spacing requirements. You may need to adjust the spacing elsewhere in your setup to compensate.

    Is this adapter compatible with other M68 systems besides Baader's?

    Yes, the M68x1 thread is a common standard used by several manufacturers for large-format accessories. This adapter should be compatible with any component that correctly implements the M68x1 female thread specification.

    Can I use this Baader adapter to attach a camera directly to my AP 2.7" focuser?

    Not by itself. This adapter's purpose is to convert the focuser thread to M68x1. You would still need additional M68 adapters and extension tubes to connect from this adapter to your specific camera's T-threads or M48 threads and to achieve the correct back focus distance.

    Why use an M68 adapter instead of a smaller M48 adapter?

    The M68 thread provides a significantly larger clear aperture than M48. For imagers using full-frame or larger sensors, using the M68 standard throughout the optical train helps to prevent vignetting (darkening of the corners of the image) that can occur when stepping down to smaller thread sizes too early.

  • Net weight (kg) 0.03
    Compatible Brands Astro Physics, Baader Planetarium, Zeiss
    Inner Diameter / Clear Aperture (mm) 64
    Outer Diameter 76
    Type of Adapter Reducing Adapter
    Optical length (mm) 15
    Outer Connection (eyepiece/-camera-sided) M68 x 1
    Inner Connection (lens sided) 2.7" Thread (68.5 mm)
    Adapters Family M68 System
  • Baader Planetarium Warranty