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SVBONY SV157 1.25-inch Extension Tube
SVBONY SV157 70mm Extension Tube - 1.25"
SVBONY SV157 70mm Extension Tube - 1.25"
SVBONY SV157 1.25-inch Extension Tube

SVBONY SV157 70mm Extension Tube - 1.25"

par SVBONY
UGC SV-W9118B
CA$17.00 - CA$17.00
CA$17.00
CA$17.00 - CA$17.00
CA$17.00
Égalisation de prix!
  • Adds Critical Focuser Out-Travel
  • Standard 1.25-inch Barrel Diameter
  • Improves Focus for Astrophotography Cameras
  • CNC-Machined Aluminum Construction
  • Secure, No-Flex Connection
En rupture temporaire
Alerte de retour en stock
Info disponibilité
Admissible à la livraison GRATUITE au Canada pour les commandes de plus de 500$.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • SVBONY SV157 1.25-inch Extension Tube

    The SVBONY SV157 1.25-inch Extension Tube provides the critical extra length needed to bring cameras and certain eyepieces to a sharp image in a standard 1.25-inch focuser. This all-metal tube adds length to your optical path, solving common focus problems when your focuser runs out of outward travel, a frequent issue in both visual and photographic setups using 1.25-inch accessories.

    Solve Focuser Travel Issues for 1.25" Accessories

    If you've ever tried to use a camera or a specific eyepiece and found you can't rack the focuser out far enough to achieve a sharp image, this is the solution. The SV157 Extension Tube fits directly into any standard 1.25-inch focuser or diagonal, instantly adding precious millimeters to your focus travel. It's an essential problem-solver for imagers using small planetary cameras and observers using eyepieces with an unusual focal plane.

    CNC-Machined Build: A Secure Fit for Your 1.25" Optical Train

    Constructed from a single piece of CNC-machined aluminum, the SV157 tube ensures a rigid and secure connection between your telescope and your accessory. The black anodized finish minimizes internal reflections, and the precise machining prevents sag or flexure that could tilt your camera sensor and ruin an image. This solid build maintains the integrity of your optical train for sharper, clearer results.

  • When do I need an SVBONY SV157 1.25-inch Extension Tube?

    You need an extension tube when your eyepiece or camera requires more "out-travel" than your telescope's focuser can provide. This often happens with Newtonian reflectors when imaging at prime focus, or with certain refractors when using specific diagonals or accessories. The SVBONY SV157 provides the extra length to push the focal plane outwards to meet your sensor or eyepiece.

    How does the SV157 Extension Tube help with astrophotography?

    Astrophotography cameras, especially small-format planetary or guide cameras, often have sensors that are recessed deep within their housing. This requires the telescope's focal plane to be positioned farther back than it would for a visual eyepiece. The SV157 Extension Tube adds the necessary distance to achieve perfect focus on the camera sensor, which is critical for sharp images.

    Will the SVBONY SV157 tube work with my 8" f/10 Schmidt-Cassegrain Telescope?

    Yes, it is compatible. While Schmidt-Cassegrains (SCTs) typically have a very large range of focus travel, an extension tube like the SVBONY SV157 can still be useful. It allows you to position accessories like off-axis guiders or filter wheels at a specific distance without having to move the primary mirror to the extreme ends of its travel, which can sometimes introduce mirror shift.

    Can I use the SVBONY SV157 Extension Tube with a Barlow lens?

    Yes. Placing the SV157 Extension Tube between a Barlow lens and an eyepiece will increase the magnification of the Barlow. This is a common technique for achieving very high magnifications for planetary imaging or observing, allowing you to fine-tune the effective focal length of your system.

    Is the SVBONY SV157 Extension Tube threaded for 1.25" filters?

    The provided product data does not specify if the SV157 Extension Tube is threaded to accept standard 1.25-inch astronomy filters. Typically, extension tubes may or may not have these threads, so you should assume it is not threaded unless specified otherwise.

    Could I use the SV157 to image the Moon with my short-tube refractor?

    Absolutely. A short-tube refractor paired with a planetary camera is a classic setup where an extension tube is often required. The SVBONY SV157 will help you achieve the necessary back focus to get sharp, detailed images of lunar craters and maria with your 1.25-inch camera.

  • SVBONY Warranty Policy