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Starlight Instruments 3.5" End Cap - for Astro-Physics Telescope Accessories
This Starlight Instruments 3.5" End Cap creates a rigid, direct-threaded connection between a 3.5" Feather Touch focuser and the extensive range of Astro-Physics accessories using a 2.7" male thread. Featuring a precision-machined 2.7" female thread, this adapter ensures a secure, flex-free attachment point critical for supporting heavy cameras, field flatteners, and reducers without introducing tilt.
Secure 2.7" A/P Threading for 3.5" Feather Touch Focusers
For imagers, a threaded connection is non-negotiable for maintaining perfect optical alignment. This end cap replaces the standard compression ring on a 3.5" Feather Touch focuser, providing a robust metal-on-metal interface for Astro-Physics accessories. It is also fully compatible with Baader Planetarium quick-lock accessories that utilize the same Astro-Physics 2.7" thread standard, expanding its utility in your imaging train.
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Zero Flexure: The direct-thread design is essential for astrophotography, preventing the subtle shifts and tilts that can occur with compression fittings when supporting a heavy camera and filter wheel.
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In-House Quality: Machined of the highest quality aluminum and finished at Starlight Instruments' facility, this end cap matches the precision and aesthetic of their Feather Touch focusers.
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Broad Compatibility: Connects to Astro-Physics accessories with a 2.7" male thread.
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What is the purpose of the Starlight Instruments 3.5" End Cap for Astro-Physics accessories?
This end cap allows you to securely attach accessories with a male Astro-Physics 2.7" thread to a 3.5" Starlight Instruments Feather Touch focuser. It creates a rigid, non-flexing connection ideal for astrophotography.
Which focusers is this 3.5" End Cap compatible with?
This end cap is designed specifically for the Starlight Instruments 3.5" Feather Touch focuser (FTF35xx series). It will not fit their 2", 2.5", or 3" models.
Will this end cap work with my Baader Planetarium ClickLock clamp that has an Astro-Physics thread?
Yes. Baader produces accessories, including their ClickLock and Quick-Lock clamps, that use the Astro-Physics 2.7" thread standard. This end cap will allow you to connect those components directly to your 3.5" Feather Touch focuser.
What are the thread specifications for this Starlight Instruments end cap?
The end cap has a female thread for Astro-Physics 2.7" male threaded accessories. Starlight does not state the thread pitch.
Why choose this threaded end cap over a standard 2" compression ring adapter on my 3.5" Feather Touch focuser?
While a compression ring is convenient for visual use and swapping eyepieces, a threaded connection is far superior for imaging. It provides a solid, metal-to-metal lock that eliminates any possibility of tilt or flexure, which is crucial for maintaining a flat field with a heavy camera, filter wheel, and other accessories attached.
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| Kind |
thread converter |
| Telescope-side connection |
thread: other (state): 3.5in Feather Touch drawtube (end cap thread); gender: None |
| Camera-side connection |
thread: other (state): 2.7in Astro-Physics thread; gender: female |
| Material |
aluminum |
| Warranty |
2 years |
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Starlight Instruments 3.5" End Cap for Astro-Physics Accessories
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- Starlight Instruments 2-Year Warranty
