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Baader Adapter - M68x1(F)/AP 2.7"(M)
The Baader Adapter with M68x1 female and AP 2.7" male threads forges a secure, direct-thread connection between Baader Planetarium's M68 system and Astro-Physics focusers or accessories using the 2.7-inch standard. With this adapter, imagers can create rigid, flexure-free optical trains by mating components from these two premium ecosystems, such as connecting Baader M68 accessories to an Astro-Physics focuser.
Bridging Baader M68 and Astro-Physics 2.7" Systems
This adapter solves a common challenge for astrophotographers: integrating best-in-class components from different manufacturers into a single, cohesive imaging train. It allows you to leverage the optical excellence of Baader's M68-threaded accessories—like the Steeltrack focuser—with the robust, large-aperture focusers and field flatteners from Astro-Physics.
By creating a direct-threaded link, the adapter eliminates potential points of flexure or tilt that can occur when stacking multiple, smaller adapters. This ensures that your optical axis remains perfectly aligned from the focuser to the camera sensor. While any adapter adds some optical path length, this component is designed to be as minimal as possible, a critical factor when managing precise back-focus requirements.
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What is the primary function of the Baader M68 to AP 2.7" adapter?
Its function is to connect two different, high-end astronomical thread standards. It allows you to attach a component with a male M68x1 thread (common on Baader Planetarium products) to a focuser or accessory that has a female Astro-Physics 2.7" thread.
Does this Baader M68/AP 2.7" adapter introduce any flexure into the imaging train?
This adapter is designed specifically to prevent flexure. By using wide-diameter, direct-threaded connections, it creates a much more rigid link than using smaller step-down rings or compression fittings, which are common sources of tilt and flex in an imaging setup.
What are the thread specifications for this Baader adapter?
The adapter has two sides:
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Female (Internal) Thread: M68 with a 1mm thread pitch (M68x1).
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Male (External) Thread: Astro-Physics 2.7" standard thread.
Will this adapter work with other brands that use M68 or 2.7" threads?
Yes, provided the threads match exactly. The M68x1 standard is used by several European brands, and the AP 2.7" thread is also used by some other high-end manufacturers. However, it is essential to verify the thread specifications on your equipment, as there are multiple "2.7-inch" thread types on the market.
How would I use this Baader adapter with my Astro-Physics refractor's imaging train?
A common scenario is connecting a Baader M68-based accessory, like a filter drawer or off-axis guider, to an Astro-Physics field flattener. You would thread this adapter into the female 2.7" thread of the flattener, which then provides a female M68 port to begin building out the rest of your Baader-based imaging train toward the camera.
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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) |
9 |
| Inner Connection (eyepiece/-camera-sided) |
M68 x 1 |
| Outer Connection (lens sided) |
2.7" Thread (68.5 mm) |
| Adapters Family |
M68 System |
| Telescope-side connection |
2.7in (68.5 mm) Astro-Physics Male |
| Camera-side connection |
M68x1 Female |
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Baader Adapter - M68x1(F)/AP 2.7"(M)
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