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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 All Celestron C11/C14 SCT Telescopes

Starlight Instruments 2.0" Adapter RP - for All Celestron C11/C14 SCT Telescopes

by Starlight Instruments
SKU SI-A20-3003-3
$130.00 - $130.00
$130.00
$130.00 - $130.00
$130.00
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  • Telescope Compatibility: Celestron C11 & C14 Schmidt-Cassegrain Telescopes
  • Focuser Fit: Starlight Instruments 2.0" Rack & Pinion Feather Touch Focuser
  • Connection Type: Threads directly to the SCT rear cell
  • Primary Function: Enables use of an external focuser to eliminate image shift
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  • Description
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  • Starlight Instruments 2.0" Adapter RP - for All Celestron C11/C14 SCT Telescopes

    This Starlight Instruments 2.0" Adapter provides the essential mechanical link for upgrading your Celestron C11 or C14 SCT with a 2.0" Feather Touch Rack and Pinion focuser, creating a rigid, thread-on connection to the telescope's rear cell. By bypassing the stock mirror-focusing mechanism, this adapter is the definitive solution for mounting a heavy-duty external focuser to your C11 or C14 for serious imaging.

    A Solid Mechanical Interface: Upgrading to a 2.0" Rack & Pinion Focuser

    To mount a high-precision Starlight Instruments focuser on your SCT, you need an equally precise mechanical adapter. This component is specifically engineered to connect the robust 2.0" Rack and Pinion Feather Touch focuser body to the rear cell of large Celestron SCTs. It creates a solid, flex-free foundation, ensuring that the focuser's sub-micron precision is transferred directly to your imaging train.

    Designed for Celestron C11 & C14 OTAs: Eliminating Image Shift

    The single biggest challenge for imagers using stock Schmidt-Cassegrains is image shift, or "mirror flop," caused by the primary mirror tilting on its baffle tube during focusing. This adapter allows you to install an external Feather Touch focuser, completely bypassing the telescope's internal mechanism. By moving the focus point outside the optical tube, you eliminate image shift, achieving a perfectly stable image plane for sharp stars and successful autofocus routines, even with the heavy C11 and C14 mirror assemblies.

    Built for Heavy Payloads: The 2.0" Rack & Pinion Advantage

    This adapter is designed exclusively for the Starlight Instruments 2.0" Rack and Pinion (RP) focuser, not the Crayford model. The rack and pinion drive is engineered for heavier imaging trains that include large format cameras, filter wheels, and off-axis guiders. This adapter ensures that the entire assembly is rigidly coupled to the telescope's optical tube, preventing any tilt or sag that could compromise your data.

  • Why do I need this specific Starlight Instruments adapter for my C11/C14?

    This adapter is precision-machined to match the specific rear cell threads of Celestron C11 and C14 telescopes and the mounting pattern of the Starlight Instruments 2.0" Rack and Pinion focuser. It ensures a secure, perfectly aligned connection, which is critical for eliminating image shift and preventing optical tilt.

    Will this adapter fit a Crayford style Feather Touch focuser?

    No. This adapter is designed exclusively for the 2.0" Rack and Pinion (RP) model. The mounting bolt pattern and focuser body are different from the Crayford versions, so you must use the correct adapter for your specific focuser model.

    How does this adapter on my Celestron C14 help image faint targets like the Whirlpool Galaxy (M51)?

    For long exposures on faint targets like the Whirlpool Galaxy (M51), maintaining perfect focus is critical. The stock focuser on a C14 can cause the mirror to shift slightly during temperature changes or autofocus adjustments, ruining sub-exposures. By enabling an external focuser, this adapter creates a stable image plane, ensuring your automated focusing routines are precise and your stars remain perfectly round throughout the night.

    What is the main benefit of installing a 2.0" Rack & Pinion focuser on my Celestron C11 for planetary imaging?

    While planetary imaging uses short exposures, achieving critical focus on details like Jupiter's Great Red Spot or the Cassini Division in Saturn's rings requires extremely fine control without any backlash or image movement. This adapter lets you mount a Feather Touch focuser, giving you the necessary sub-micron precision to snap details into perfect focus, something the coarse stock focuser knob cannot achieve.

    How does this adapter attach to the C11/C14 telescope?

    The adapter threads directly onto the large rear cell of the Celestron C11 or C14, replacing the standard visual back or any other accessories you might have attached. This provides a direct, rigid connection between the telescope tube and the new focuser body.

    Is installation of the Starlight Instruments adapter difficult?

    Installation is generally straightforward. It involves unthreading the stock visual back from your telescope's rear cell, threading this adapter on in its place, and then bolting the Feather Touch focuser to the adapter. For detailed instructions on focuser attachment, always refer to the manual provided with your Starlight Instruments focuser.

  • Starlight Instruments 2-Year Warranty