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Tube Rings
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90mm Tube Rings
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These high-quality 90mm i.d. split and hinged optical tube mounting rings are made of solid aluminum, anodized black for long life. They use stainless steel hardware and are felt-lined to fit refractors with a 90mm OD tube, such as the Astro-Tech AT80 and all William Optics 80mm telescopes (all versions of the Megrez 80 and ZenithStar 80, for example), plus any other refractor with a 90mm OD tube.
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114mm Tube Rings
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These high-quality 114mm i.d. split and hinged refractor optical tube mounting rings are made of solid aluminum, anodized black for long life. They use stainless steel hardware and are felt-lined to fit refractors with a 114mm OD tube, such as the Takahashi FS-102 and FSQ-106, William Optics FL-105, plus any other scope with a 114mm OD tube.
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90mm Finder/Photoguide Ring System
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This large finderscope/photoguide telescope mounting ring system will mount a short focal length refractor optical tube on a Celestron or Meade Schmidt-Cassegrain or Ritchey-Chrétien telescope rear cell. It lets you use the refractor as a high power/variable power finderscope for your larger telescope; as a photoguide scope for long exposure deep sky photography with the main scope; or as a wide field astrograph.
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