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Starlight Instruments 3.0" Adapter for Older Astro-Tech 111
This Starlight Instruments 3.0" adapter provides a mechanically perfect connection between an older Astro-Tech 111 refractor and a premium Starlight focuser, using a specific M124X1 thread to ensure a rigid, non-flexing imaging train. It replaces the stock focuser interface, allowing you to install a Feather Touch or other 3.0" Starlight Instruments focuser for superior load-bearing capacity and focusing precision.
A Precision M124X1 Interface for the Astro-Tech 111
This adapter is engineered for one specific telescope: the older model of the Astro-Tech 111 triplet refractor. It features a female M124X1 thread that mates directly to the optical tube assembly, providing a secure, metal-on-metal connection that is essential for astrophotography. Machined from a single piece of high-quality aluminum and finished to Starlight Instruments' exacting standards, this adapter eliminates the potential for tilt or sag that can occur with universal-fit solutions.
Teflon-Coupled Design for 360° Focuser Rotation
The adapter incorporates a Teflon-lined coupling, a signature feature of Starlight Instruments' mounting systems. This allows a mounted 3.0" focuser to rotate a full 360° with minimal effort, letting you frame your imaging target at any angle without loosening the focuser itself. The smooth, low-friction surface prevents the aluminum parts from galling or binding, ensuring consistent and reliable operation for years.
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How do I know if this Starlight Instruments adapter fits my Astro-Tech 111?
This adapter is specifically for older Astro-Tech 111 models that use an M124X1 thread on the optical tube. Newer versions of the AT111 may use a different thread size. You must confirm your telescope's thread dimension before purchasing to ensure compatibility.
What does "Teflon coupled" mean for the Astro-Tech 111 adapter?
"Teflon coupled" means there is a low-friction PTFE lining between the adapter and the focuser body. This allows you to rotate your entire focuser and imaging camera smoothly to frame your object without introducing any play or flexure into the optical train.
What material is the Starlight Instruments M124X1 adapter made from?
The adapter is machined from high-quality aluminum and is finished in-house at Starlight Instruments to match the look and feel of their Feather Touch focusers. This ensures both structural rigidity and durability.
Will this adapter allow me to use a 2-inch focuser on my Astro-Tech 111?
No, this adapter is designed to connect the M124X1 thread of the Astro-Tech 111 to a Starlight Instruments 3.0" focuser. It is not compatible with 2-inch or 2.5-inch focusers.
Why should I upgrade the focuser on my Astro-Tech 111 with this adapter?
Using this adapter to install a Starlight Instruments 3.0" focuser provides a significant upgrade for astrophotography. The larger focuser offers greater stability for heavy cameras and filter wheels, eliminating droop and ensuring a flat field for sharp stars from edge to edge, especially when imaging demanding targets like the Andromeda Galaxy (M31).
Is installation of this Astro-Tech 111 adapter difficult?
Installation is straightforward. You typically unthread the entire stock focuser assembly from the optical tube and then thread this adapter on in its place. Once the adapter is securely attached, the 3.0" Starlight Instruments focuser can be installed onto it.
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| Compatibility |
Older Astro-Tech 111 Refractors |
| Telescope-Side Thread |
M124x1 Female |
| Focuser-Side Mount |
Starlight Instruments 3.0" Focuser |
| Material |
Machined Aluminum |
| Coupling |
Teflon-Lined for Rotation |
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Starlight Instruments 2-Year Warranty
