Apertura 25mm Extension Ring with M117 Threads - RC1025

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Item #APER-A-RC1025

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  • $29.95

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  • 25mm Extension Ring
  • Bolster the focal length of your GSO 10" RC Astrograph
  • Designed with black-anodized aluminum
  • Delivers an additional 25mm of focal length
  • Minimize downward tilt when adding heavy loads
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  • Description

    Apertura 25mm Extension Ring
    with M117 Threads

    This Apertura 25mm Extension Tube is designed for the GSO 10" Ritchey-Chretien Astrograph, but it will also work with the GSO 12" RC or any product that accepts M117 threads. It is meant to be placed between the telescope and the focuser to extend back focus by 25mm. You can stack different lengths of extension rings to achieve the back focus you require for your imaging set-up. With an extension added at this location, you won't have to extend the draw tube as far, which will minimize downward tilt with heavy loads.

    Supplier SKU


  • Dimensions & Specifications

    • Model Number: RC1025

    • Extension or Spacer Size(s): .98" or 25mm

  • Product Guarantee

    We stand behind all the products we sell, and your satisfaction is our top priority. If you're not satisfied with the quality of your purchase, simply send the item back to us in its original packaging within 30 days of its delivery.

    Manufacturer Warranty

    Apertura Absolute Warranty: Initial 2 year warranty against product defects, followed by a 3 year accident replacement program.

    Return & Exchange Policy

    At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.

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