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Baader Adapter - M68x1(M)/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.
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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 much optical path length does this M68 adapter add?
Baader gives the optical length as 15 mm, and 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.
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| 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 |
| Telescope-side connection |
2.7in (68.5 mm) Astro-Physics Female |
| Camera-side connection |
M68x1 Male |
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Baader Planetarium Warranty
