GSO 25mm Extension Tube for 6" and 8" RC Telescopes with M90x1 Thread

Our Price: $22.95
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Our Product ID: PAAR-GS-FF083
Manufacturer SKU: FF083
Item Can Ship: Worldwide
GSO 25mm Extension Tube for 6" and 8" RC Telescopes with M90x1 Thread

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Quick Overview

  • GSO 25mm-long x 90mm extension ring for 8” RC telescopes
  • Ideal for adjusting back focus to minimize extension of focuser tube
  • Made of black-anodized aluminum with anti-reflection threading

Product Details

This GSO 25mm x 90mm extension ring can be installed between the rear cell of your 8” GSO Ritchey-Chretien telescope and your focuser. It’s ideal for adjusting and fine tuning the back focus for your imaging system.

Most GSO RC scopes come with extension rings. But in some cases, a little extra (or different) length is required to minimize the extension of the tube of your telescope’s Crayford focuser. That’s especially true when your focuser must hold a heavy load that includes camera, filter wheel, and other accessories. If the focuser tube extends too much, some flexure may result that can affect image quality.

This extension ring has 90mm x 1mm metric threads, male on one side to thread into your existing extension rings or focuser, and female on the other end to thread into your telescope’s rear cell or the other end of your extension rings. The ring is machined of black-anodized aluminum and includes an anti-reflection threading.

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