Skip to content
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 for Takahashi FS78/FSQ85/FC100DF Telescopes

by Starlight Instruments
SKU SI-A20-304
$160.00 - $160.00
$160.00
$160.00 - $160.00
$160.00
Price Match Policy!
  • Designed for Starlight Instruments 2.0" Feather Touch Focusers
  • Compatible with Takahashi FS78 Refractors
  • Compatible with Takahashi FSQ85 Astrographs
  • Compatible with Takahashi FC100DF Refractors
  • Provides a Secure, No-Flexure Mechanical Interface
Backordered
Request Stock Alert
Availability Info
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Warranty

  • Starlight Instruments 2.0" Adapter for Takahashi FS78/FSQ85/FC100DF Telescopes

    The Starlight Instruments 2.0" Adapter provides the essential mechanical link to upgrade your Takahashi FS78, FSQ85, or FC100DF telescope with a Feather Touch focuser. This component replaces the stock focuser connection, creating a solid, thread-on mounting point for the world-class precision of a 2.0" Starlight Instruments focuser.

    Precision Fit for Takahashi FS78, FSQ85, and FC100DF

    This is not a universal adapter. It is specifically machined by Starlight Instruments in the USA to match the rear cell threads of the Takahashi FS78, FSQ85, and FC100DF optical tubes. This dedicated design ensures perfect alignment and zero flexure, which is critical for astrophotography where any tilt in the optical train can compromise star shapes at the edge of the field.

    The Gateway to 2.0" Feather Touch Focusing

    Installing a 2.0" Feather Touch focuser transforms the usability of your Takahashi telescope, especially for imaging. This adapter enables that upgrade, allowing you to benefit from the Feather Touch's dual-speed fine focusing, high load capacity for heavy cameras and filter wheels, and complete elimination of the image shift that can plague lesser focusers. For the serious imager, this adapter is the first step toward achieving automated, repeatable, and flawless focus.

  • Which Starlight Instruments focusers work with this Takahashi adapter?

    This adapter is designed to connect Starlight Instruments 2.0" Feather Touch focusers, such as the FTF20 series, to the specified Takahashi telescope models. It is not compatible with 2.5", 3.0", or larger focusers.

    Why should I replace the stock focuser on my Takahashi FC100DF?

    While the stock Takahashi focuser is excellent for visual use, astrophotography with heavy cameras, filter wheels, and off-axis guiders demands higher load capacity and finer control. Upgrading to a 2.0" Feather Touch focuser via this adapter provides a more robust, backlash-free system that is better suited for critical, automated focusing routines.

    Will this adapter introduce any tilt or flexure into my imaging train?

    No. This adapter is precision-machined by Starlight Instruments from high-grade aluminum to provide a rigid, perfectly orthogonal connection between the telescope tube and the focuser. When installed correctly, it creates a solid mechanical interface that prevents tilt and flexure.

    Is the installation of this Takahashi adapter difficult?

    Installation is straightforward for users comfortable with basic telescope hardware. It typically involves unthreading the stock focuser assembly from the optical tube's rear cell and threading this adapter in its place. The Feather Touch focuser then attaches to the adapter.

    Can I use this adapter with a 2.5" or 3.0" Feather Touch focuser?

    No, this adapter is specifically designed for the mounting pattern and profile of Starlight Instruments' 2.0" focusers. You would need a different adapter to mount a larger focuser body.

    What is the main benefit of using this adapter on my FSQ85 for astrophotography?

    For an imaging instrument like the FSQ85, the primary benefit is enabling the use of a heavy-duty, automated focuser. A 2.0" Feather Touch focuser can handle the weight of a cooled astronomy camera, filter wheel, and guider without slipping or flexing, and its precision is essential for achieving perfect focus with autofocusing software.

  • Starlight Instruments 2-Year Warranty