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Starlight Instruments True 3.0" End Cap w/ 3.0" Compression Ring Opening
This Starlight Instruments End Cap adapts any Feather Touch True 3.0" focuser to accept 3.0" eyepieces and accessories. It has a 3.0" opening with 3 machined thumb screws to hold your accessory securely.
For True 3.0" Focusers: A Secure 3.0" Compression Ring Connection
Designed specifically for Starlight Instruments' large-aperture True 3.0" focusers, this end cap is the essential link for using large-format 3.0" visual and imaging accessories.
Starlight 3.0" End Caps: Compression Ring vs. Threaded Attachments
Choosing the right end cap depends entirely on your application. This 3.0" compression ring model is the superior choice for visual observers who need to quickly and securely swap between different eyepieces or accessories during a session.
For dedicated astrophotography with a heavy, fixed imaging train, a threaded end cap provides a more rigid, semi-permanent connection. The trade-off is convenience for absolute stability; for visual use or lighter imaging setups, the quick, secure hold of the compression ring is ideal.
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What focusers is the Starlight Instruments True 3.0" End Cap compatible with?
This end cap is specifically designed for the Starlight Instruments Feather Touch True 3.0" focuser series, such as the FTF32xxB-A. It is not compatible with their standard 3.0", 2.5", or smaller focusers due to differences in the drawtube threading and diameter.
Why should I choose this 3.0" compression ring end cap over a threaded one for my Starlight focuser?
The compression ring is ideal for visual observers who frequently swap 3.0" eyepieces or accessories. It provides a quick, secure grip. A threaded end cap is preferred for dedicated imaging setups, as it creates a more rigid connection for heavy cameras and filter wheels.
Can I use this Starlight end cap to connect my imaging train to a Tele Vue Paracorr on a Dobsonian?
This end cap is for attaching accessories with a 3.0" slip-in barrel. If your Paracorr or imaging train terminates in a 3.0" barrel, this will provide a secure connection. However, for a rigid, threaded connection required by many imaging setups, a threaded end cap specific to your corrector's thread pitch would be a more robust solution.
Does this Starlight True 3.0" End Cap allow for tilt adjustment?
Most Starlight end caps have 3 set screws on the face for collimation, but only 3 machined thumb screws are mentioned for this end cap, so tilt adjustment on this model is not confirmed.
I want to use a large format 3.0" eyepiece with my custom-built reflector featuring a Feather Touch FTF3215B-A focuser. Is this the right part?
Absolutely. This True 3.0" End Cap is the correct component to adapt your FTF3215B-A focuser for use with 3.0" barrel eyepieces. It will provide the secure grip needed for large and heavy visual accessories.
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| Kind |
visual adapter |
| Telescope-side connection |
thread: other (state): True 3.0in Feather Touch drawtube (end cap thread); gender: None |
| Camera-side connection |
thread: 3in barrel; gender: clamp |
| Material |
aluminum |
| Warranty |
2 years |
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Starlight Instruments True 3.0" End Cap w/ 3.0" Compression Ring Opening
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- Starlight Instruments 2-Year Warranty
