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Reach Focus with Confidence: The Tele Vue 2" Extension Tube
The Tele Vue 2" Extension Tube (TV-X2C-0008) is a fundamental problem-solver for observers and imagers who need to add extra outward travel to their 2-inch focuser. It provides a fixed 2-inch (50.8mm) path extension, enabling you to achieve a sharp focus with accessories that have a long back-focus requirement or when using a telescope with limited focuser travel.
Achieve Necessary Outward Focuser Travel
Many modern accessories, particularly coma correctors, focal reducers, and certain long focal length eyepieces, require the focuser to be racked further out than some telescopes allow. This extension tube provides the precise 2-inch spacing needed to bring these accessories into the focal plane. Its fixed length is a simple, rigid solution that introduces no flexure or alignment issues into your optical train.
For visual observers, this means you can finally use that favorite low-power, 2-inch eyepiece that just wouldn't come to focus in your reflector. For imagers, it provides the critical distance needed to place a camera sensor at the correct operational distance from a flattener or reducer, ensuring a sharp, well-corrected field from edge to edge.
Secure, Non-Marring Brass Clamp Ring
The core of the Tele Vue extension tube's design is its non-marring brass clamp ring. When you tighten the thumbscrew, it presses on this soft, continuous ring rather than digging directly into the barrel of your eyepiece or camera nosepiece. This mechanism distributes the pressure evenly around the barrel for a more secure, centered lock.
The direct benefit is the complete elimination of gouges and scratches on your expensive accessories. The single, oversized thumbscrew is easy to manipulate even with gloves on, providing a firm grip without requiring excessive force. This preserves the value and cosmetic condition of your gear while ensuring a solid connection.
Undercut Safety Groove for Equipment Security
A common point of failure in any optical train is an accessory slipping out of a focuser or diagonal. Tele Vue addresses this with a machined undercut safety groove on the barrel. This groove provides a catch for the thumbscrew of your focuser, preventing the extension tube, and anything attached to it, from falling to the ground if the screw loosens slightly.
This small detail provides significant peace of mind, especially when you have a heavy eyepiece or a valuable camera attached. It’s a simple mechanical feature that protects your investment against an accidental slip, letting you observe or image with greater confidence.
Built for a Lifetime of Use
Like all Tele Vue accessories, the TV-X2C-0008 is built to a standard, not a price. The main body is machined from solid aluminum and anodized for a durable, scratch-resistant finish. The internal surfaces are blackened to absorb stray light, which helps maintain maximum contrast in your field of view by preventing off-axis reflections.
This isn't an accessory you'll need to replace. Its robust construction ensures that it will maintain perfect alignment and function reliably for years, session after session. It's a small but essential part of the imaging or observing chain that upholds the quality of the components around it.
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When do I need a 2-inch extension tube?
You need an extension tube when your eyepiece or camera cannot reach focus because your telescope's focuser runs out of outward travel. This is common in Newtonian reflectors when switching from visual use to imaging, or when using accessories like Barlows or coma correctors.
Will this extension tube cause vignetting?
With its 2-inch clear aperture, the Tele Vue extension tube is designed to prevent vignetting with most eyepieces and sensors up to full-frame size (35mm format). Its internal baffling further ensures that off-axis light does not reduce image contrast.
Why use a fixed extension tube instead of a variable one?
A fixed extension tube like the Tele Vue TV-X2C-0008 provides superior rigidity and maintains perfect optical alignment. Variable extensions can sometimes introduce flex or tilt, which can degrade image quality, especially in demanding imaging applications.
How does the brass clamp ring work?
The thumbscrew pushes against a soft brass ring inside the barrel, which then gently and evenly grips your accessory. This prevents the screw from directly scarring the barrel of your eyepiece or camera nosepiece, preserving its condition.
Is this compatible with 1.25" accessories?
Yes, you can use 1.25" accessories with this extension tube by inserting a standard 2" to 1.25" adapter into it. The brass clamp ring will securely hold the adapter in place.
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| Product Number |
TV-X2C-0008 |
| Barrel Size |
2" |
| Extension Length |
2" (50.8mm) |
| Locking Mechanism |
Brass Clamp Ring with Single Thumbscrew |
| Weight |
4.8 oz (136g) |
| Material |
Black Anodized Aluminum, Brass |
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Tele Vue 2" Extension Tube
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Tele Vue 5-Year Limited Warranty
