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Achieve Perfect Back Focus with the Tele Vue 2.4" Accessory Tube
The Tele Vue 2.4" Accessory Tube - 0.375" (9.5mm) is a precision-machined spacer designed to solve critical back focus spacing for imagers using Tele Vue NPis telescopes and accessories. It provides exactly 9.5mm of rigid extension, allowing you to accurately place your camera sensor at the optimal focal plane when working with reducers, flatteners, or specific camera adapters. This is not just a tube; it is a calibrated tool for achieving the sharpest possible stars across your large-format imaging sensor.
Engineered for a Secure Optical Train
This extension tube is built to integrate flawlessly into the Tele Vue 2.4" accessory ecosystem. Both the male and female threads are machined to tight tolerances, ensuring a square, no-tilt connection that preserves the optical alignment of your imaging train. The interior is blackened to absorb stray light, protecting the high contrast delivered by your Tele Vue refractor.
For imagers, this rigid, threaded connection is a significant upgrade over thumbscrew-based adapters. It eliminates the potential for sensor tilt and flexure, which can ruin long exposures with elongated stars in the corners of the frame. By using the TLC-0500, you maintain a robust, repeatable connection from the focuser to your camera, night after night.
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What is the main purpose of the Tele Vue 9.5mm extension tube?
Its primary function is to add a precise 9.5mm (0.375 inches) of spacing in an imaging train to achieve the exact back focus required by a field flattener or focal reducer, most commonly with Tele Vue NP101is and NP127is telescopes.
Will this accessory work with standard 2" focusers?
No, this tube uses Tele Vue's proprietary large-format 2.4" threading. It is designed specifically for Tele Vue focusers and accessories that share this larger, more rigid connection standard.
Can I stack multiple 2.4" accessory tubes?
Yes, these tubes are designed to be threaded together to create custom spacing lengths. For example, combining this 9.5mm tube with a 6.4mm (0.25") tube would provide 15.9mm of total extension.
How do I know which extension tube length I need?
The required length depends on your specific camera, flattener/reducer, and any other accessories in your imaging train. You must consult the back focus requirements specified in your Tele Vue telescope or flattener manual to calculate the total spacing needed.
Is this better than using a variable extension tube?
For a fixed imaging setup, this solid tube provides a more rigid and stable connection than most variable extenders. This rigidity helps prevent sensor tilt, which is crucial for achieving sharp stars across the entire field with large sensors.
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| Product Code |
TLC-0375 |
| Extension Length |
9.5mm (0.375") |
| Diameter |
2.4" |
| Connection Type |
Male and Female 2.4" Tele Vue Accessory Thread |
| Material |
Black Anodized Aluminum |
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Tele Vue 2.4" Accessory Tube - 0.375" (9.5mm)
× 1
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Tele Vue 5-Year Limited Warranty
