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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Starlight Instruments 2.0" Adapter RP for Astro-Tech 6" and 8" RITCHIE CHRETIEN Telescopes
Starlight Instruments 2.0" Adapter RP for Astro-Tech 6" and 8" RITCHIE CHRETIEN Telescopes
Starlight Instruments 2.0" Adapter RP for Astro-Tech 6" and 8" RITCHIE CHRETIEN Telescopes
Starlight Instruments 2.0" Adapter RP for Astro-Tech 6" and 8" RITCHIE CHRETIEN Telescopes

Starlight Instruments 2.0" Adapter RP for Astro-Tech 6" and 8" RITCHIE CHRETIEN Telescopes

by Starlight Instruments
SKU SI-A20-3003-1
$130.00 - $130.00
$130.00
$130.00 - $130.00
$130.00
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  • Connects a Starlight Instruments 2.0" Rack and Pinion focuser to your telescope
  • Designed for Astro-Tech 6" and 8" Ritchey-Chrétien models
  • Also compatible with GSO 6" and 8" Ritchey-Chrétien models
  • Provides a rigid, direct-thread connection for zero flexure
  • Essential for astrophotography with heavy imaging trains
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  • Description
  • FAQ
  • Specifications
  • Warranty

  • Starlight Instruments 2.0" Adapter RP for Astro-Tech 6" and 8" RITCHIE CHRETIEN Telescopes

    This Starlight Instruments adapter provides the specific mechanical interface required to mount a 2.0" Feather Touch Rack and Pinion focuser onto Astro-Tech or GSO 6" and 8" Ritchey-Chrétien telescopes. It is the critical component that allows you to replace the stock focuser with a heavy-duty, zero-image-shift system built for serious astrophotography.

    A Rock-Solid Mechanical Connection for 2.0" Feather Touch Focusers

    This is not a generic, universal adapter. It is precision-machined by Starlight Instruments to thread directly onto the rear cell of the specified 6" and 8" RC telescopes. This creates a secure, rigid connection to the telescope tube, providing the stable foundation that the 2.0" Feather Touch Rack and Pinion focuser needs to perform correctly and support heavy loads without flexure or tilt.

    Enabling Precision Focus on 6" and 8" Ritchey-Chrétien Telescopes

    Astro-Tech and GSO Ritchey-Chrétien telescopes are powerful imaging instruments, but their full potential is often limited by the stock focuser. This adapter is the key to unlocking that potential. It enables the installation of a Starlight Instruments Rack and Pinion focuser, a model specifically designed to handle the weight of modern DSLR or dedicated astronomy cameras, filter wheels, and off-axis guiders without slipping or shifting focus during a long-exposure sequence.

  • Will this Starlight Instruments adapter fit a 2.0" Feather Touch Crayford focuser?

    No, this adapter is specifically designed for the Starlight Instruments 2.0" Rack and Pinion (RP) model. The mounting pattern and mechanical requirements are different for the Crayford focusers, which require a different adapter.

    How does this adapter install on an Astro-Tech 8" RC?

    Installation involves removing the stock focuser and its mounting plate from the rear cell of the telescope. This Starlight Instruments adapter then threads directly onto the telescope's rear cell, providing the correct interface to attach your 2.0" Feather Touch RP focuser.

    Why do I need this specific adapter for my GSO 6" Ritchey-Chrétien?

    This adapter provides the correct proprietary threading and flange distance to securely mount a Starlight Instruments 2.0" RP focuser onto your telescope. Using a purpose-built adapter ensures perfect alignment with the optical axis, which is critical for maintaining the flat, coma-free field of a Ritchey-Chrétien design.

    Is this adapter necessary for imaging the Andromeda Galaxy (M31) with my 8" RC and a heavy camera?

    Absolutely. When imaging large targets like the Andromeda Galaxy (M31), you need perfectly round stars from edge to edge. This adapter lets you install a heavy-duty Rack and Pinion focuser capable of supporting a full imaging train without flexure. This prevents tilted focal planes and elongated stars, which is essential for sharp, high-quality astrophotos.

    Can I use this adapter on a 10" Astro-Tech RC telescope?

    No. This adapter is specifically machined for the rear cell threading and dimensions of the 6" and 8" Astro-Tech and GSO RC models only. Larger telescopes in the series have a different mechanical interface and require a different adapter.

    What is the main benefit of upgrading my 6" RC's focuser using this Starlight Instruments adapter?

    The primary benefit is replacing the stock focuser with a zero-image-shift, high-load-capacity Feather Touch Rack and Pinion focuser. For a 6" RC used for astrophotography, this upgrade is transformative, eliminating focus drift and flexure even when using heavy cameras, filter wheels, and other accessories.

  • Focuser Compatibility Starlight Instruments 2.0" Feather Touch Rack and Pinion Focuser
    Telescope Compatibility Astro-Tech 6" and 8" Ritchey-Chrétien Telescopes
    Telescope Compatibility GSO 6" and 8" Ritchey-Chrétien Telescopes
  • Starlight Instruments 2-Year Warranty