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The Solid Foundation for Your Tele Vue Imaging Rig
The Tele Vue Standard T-Ring Adapter for 2.4" (TRG-1072) is the essential, rock-solid link between your Tele Vue NPis telescope's focuser and your T-threaded astronomy camera or DSLR T-ring. This is not just a simple adapter; it is an engineered component designed to eliminate flexure and maintain precise optical alignment, ensuring your flat-field astrograph performs exactly as designed. It replaces potential weak points in your imaging train with a secure, threaded connection you can trust.
The Secure 2.4-inch Imaging System Connection
At the heart of Tele Vue's imaging platform is the large-format 2.4-inch focuser drawtube, designed to prevent vignetting with full-frame sensors. This adapter threads directly and securely onto that drawtube, or any other accessory in the Imaging System chain. This direct-thread approach creates a rigid, unified tube, removing the possibility of sag or tilt that can occur with thumbscrew-based adapters and ruin an otherwise perfect exposure.
Universal T-Thread for Camera Compatibility
The output side of the adapter features a standard male T-thread (M42x0.75), the universal standard for astrophotography hardware. This allows you to directly connect most dedicated astronomy cameras from ZWO, QHY, and others, as well as the T-ring for your specific Canon, Nikon, or Sony DSLR/mirrorless camera. This broad compatibility makes the TRG-1072 the primary building block for nearly any imaging setup with a Tele Vue refractor.
Engineered for Minimal Back-Focus
Every millimeter of back-focus is precious, especially when using reducers or flatteners that have strict spacing requirements. The TRG-1072 is designed with a minimal optical length of just 0.35 inches (8.9mm). This slim profile gives you maximum flexibility to insert other accessories like filter wheels or off-axis guiders into your imaging train without exceeding the critical back-focus distance of your optical system.
Durable, Reflection-Free Construction
Machined from a single piece of aluminum and finished with a deep black anodizing, this adapter is built for durability and optical purity. The non-reflective internal surfaces are micro-baffled to trap any stray light that might enter the system, protecting the contrast of your images. This robust construction ensures that the adapter will not introduce any optical artifacts and will withstand years of use in the field.
Building Your Imaging Train: An Example
Imagine you are connecting a ZWO ASI2600MC Pro camera to your Tele Vue NP101is. You would thread the TRG-1072 directly onto the telescope's focuser drawtube. The camera, which typically has 17.5mm of back-focus and comes with its own set of T2 spacers, would then thread directly onto the male T-threads of this adapter. This simple, two-part connection provides a rigid, perfectly aligned imaging train ready for capturing deep-sky objects without fear of tilt or flexure.
Limitations and Considerations
The primary trade-off for this adapter's rigidity is its specificity. It is designed exclusively for the Tele Vue 2.4-inch Imaging System and will not connect to standard 2-inch focusers or accessories from other brands. It is a dedicated part for a dedicated system. For imagers who frequently switch between different telescope brands, this requires a brand-specific adapter for each setup.
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Is this the right adapter for my Tele Vue NP127is and ZWO camera?
Yes, this is the standard adapter for connecting any camera with female T-threads (M42x0.75) to the 2.4-inch focuser on a Tele Vue NPis series telescope.
Will the TRG-1072 work with the Tele Vue 0.8x reducer?
Yes. This adapter is a key component for building the correct spacing when using the NPR-2073 0.8x reducer. It typically threads onto the reducer, and your camera's T-ring or spacers then thread onto this adapter.
What's the difference between this and the Canon Wide T-Adapter (CWT-2070)?
The TRG-1072 provides a generic male T-thread, requiring you to use a separate T-ring for your camera body. The CWT-2070 combines the adapter and a Canon EOS bayonet mount into a single, wider-aperture piece to better illuminate full-frame sensors.
Does this adapter cause any vignetting?
When used with cameras having APS-C or smaller sensors, the T-thread connection of this adapter will not cause vignetting. For full-frame (35mm) sensors, you may see slight corner darkening, and the Tele Vue Canon or Nikon Wide T-Adapters are recommended for a fully illuminated field.
Why use this instead of a 2" nosepiece?
A threaded connection like the one this adapter provides is far more secure than a 2" nosepiece held by thumbscrews. It completely eliminates any possibility of camera tilt or sag, which is critical for maintaining a perfectly flat field for astrophotography.
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| Product Code |
TRG-1072 |
| Telescope Side Connection |
Tele Vue 2.4" Female Thread |
| Camera Side Connection |
Male T-Thread (M42x0.75) |
| Optical Length |
0.35" (8.9 mm) |
| Material |
Black Anodized Aluminum |
| Clear Aperture |
~38 mm |
| Weight |
1.8 oz (51 g) |
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Tele Vue Standard T-Ring Adapter for 2.4"
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Tele Vue 5-Year Limited Warranty
