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Starlight Instruments 2.5" Adapter PTFE Coupled Collar for 2.5" Feather Touch Focusers
This Starlight Instruments 2.5" adapter creates a direct, secure attachment for your 2.5" Feather Touch focuser using a precision-machined 95x1mm male thread. Its integrated PTFE-coupled collar enables full 360° rotation of the entire focuser body.
Secure 95x1mm Threaded Connection for FTF25 Focusers
This adapter serves as the critical mechanical interface between your telescope and a Starlight Instruments FTF25 series focuser. The 95x1mm male threading ensures a rigid, zero-flex connection, preventing any tilt or sag that could compromise collimation, which is essential for astrophotography with heavy cameras and filter wheels.
PTFE-Lined for 360° Smooth Focuser Rotation
The core of this adapter is its PTFE-lined (Teflon) collar. This low-friction surface allows the entire 2.5" Feather Touch focuser to rotate a full 360° within the adapter with buttery smoothness. This lets you perfectly frame your target without having to rotate your camera or diagonal, and makes it easy to position the focus knobs for comfortable access regardless of your telescope's orientation.
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What is the purpose of the Starlight Instruments 2.5" PTFE Coupled Collar Adapter?
This adapter physically connects a 2.5" Feather Touch focuser (FTF25 series) to a telescope that has a corresponding 95x1mm female thread. Its primary feature is the PTFE-lined collar, which allows the entire focuser body to be rotated 360° for convenient framing and access to the focus knobs.
I have a telescope with a 95x1mm female thread. Will this adapter let me install an FTF25 series focuser?
Yes, absolutely. This adapter is specifically designed for that purpose. It will thread directly into your telescope's 95x1mm port and provide the correct interface to mount any focuser from the Starlight Instruments 2.5" FTF25 series.
What does 'PTFE-Coupled' mean for this Starlight Instruments adapter?
PTFE is the chemical name for Teflon. A 'PTFE-Coupled' or 'PTFE-Lined' collar means the inner surface of the adapter where the focuser sits is lined with this extremely low-friction material. This is what enables the smooth, effortless 360° rotation of the focuser body, even with a heavy imaging train attached.
After installing my 2.5" Feather Touch focuser with this adapter, how do I rotate it to frame a galaxy like Andromeda (M31)?
To rotate the focuser, you simply loosen the nylon-tipped gold thumbscrews around the adapter collar that lock the focuser in place. Once loose, you can turn the entire focuser assembly to your desired orientation to best frame the Andromeda Galaxy (M31). Once you are satisfied with the framing, you tighten the thumbscrews to lock it securely in place.
How is this adapter installed on my telescope?
Installation is straightforward. First, you carefully thread the 95x1mm male end of the adapter into the female port on your telescope's rear cell until it is snug. Do not overtighten. Then, you insert the base of your 2.5" Feather Touch focuser into the adapter and secure it by tightening the 3 gold thumbscrews on the adapter.
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| Adapter Size |
For 2.5" Feather Touch Focusers |
| Telescope-Side Thread |
95x1mm Male |
| Mechanism |
PTFE-Coupled Rotating Collar |
| Compatibility |
Starlight Instruments FTF25 Focuser Series |
| Kind |
Tube adapter ring (PTFE coupled) |
| Camera-side connection |
2.5" Feather Touch focuser (3 thumbscrews) |
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2.5" Adapter with 95x1mm Male Thread
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Starlight Instruments 2-Year Warranty
