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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 3.0" Base Flat w/ Leveling Screws

Starlight Instruments 3.0" Base Flat w/ Leveling Screws

by Starlight Instruments
SKU SI-BA30FL
$150.00 - $150.00
$150.00
$150.00 - $150.00
$150.00
Price Match Policy!
  • For 3.0" Feather Touch Focusers
  • Flat Base for Custom Mounting
  • Includes Leveling Screws for Collimation
  • 4.0" Center-to-Center Mounting Hole Pattern
  • Requires A30-1903-1 Tube Adapter Ring (M109x1 Thread)
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Starlight Instruments 3.0" Base Flat w/ Leveling Screws

    The Starlight Instruments 3.0" Flat Base provides a solid, adjustable mounting solution for the 3.0" Feather Touch Focuser, designed for custom telescope builds with flat mounting surfaces. It features a standard 4.0" center-to-center mounting hole pattern and is engineered to thread into the A30-1903-1 tube adapter ring with its M109x1 threads, which must be purchased separately.

    Secure Mounting and Precise Collimation for 3.0" Feather Touch Focusers

    This base is the critical link for integrating a premium 3.0" Feather Touch focuser into a custom-built instrument. Its integrated leveling screws are not just for mounting; they are a precision tool for collimating your entire imaging train, allowing you to eliminate sensor tilt for perfectly sharp stars from corner to corner.

    • Flat Mounting Surface: Designed specifically for telescope tubes or mounting plates that have a flat surface, providing a stable foundation without the need for a curved adapter.
    • Leveling Screw Adjustment: Integrated leveling screws allow you to make minute adjustments to the focuser's tilt. This capability is essential for dialing in the collimation of the imaging train, ensuring a perfectly flat field.
    • Required Adapter Ring: This base is designed to work in conjunction with the Starlight Instruments A30-1903-1 tube adapter ring. The base threads into this ring, which provides the M109x1 threads needed to attach the 3.0" Feather Touch focuser.
    • Mounting Hardware Included: The base comes complete with the necessary hardware for mounting, simplifying installation on your custom instrument.

  • What is the primary purpose of the Starlight Instruments 3.0" Flat Base?

    This base serves as a secure and adjustable interface to mount a 3.0" Feather Touch focuser onto a custom telescope or instrument with a flat mounting surface. Its key feature is the set of leveling screws for precise optical alignment, allowing you to eliminate sensor tilt.

    Do I need other parts to attach my 3.0" Feather Touch focuser to this base?

    Yes. This base requires the Starlight Instruments A30-1903-1 tube adapter ring, which is sold separately. The base threads into this ring, and the ring provides the M109x1 threads to attach the focuser itself.

    How do the leveling screws on the Starlight Instruments 3.0" Base improve my astrophotography?

    The leveling screws allow you to correct for any tilt in your imaging train. By making fine adjustments, you can ensure your camera sensor is perfectly perpendicular to the telescope's optical axis. This is critical for achieving sharp, round stars across the entire field of view, especially when imaging with a large-format sensor on a fast system like a custom Newtonian.

    Can I use this Starlight Instruments base on a curved telescope tube like a large Dobsonian?

    No, this model is the Flat Base, specifically designed for flat surfaces. For mounting on a curved tube, Starlight Instruments offers curved bases that are machined to match the radius of the telescope tube to ensure a secure fit.

    What is the mounting hole pattern for the Starlight Instruments 3.0" Flat Base?

    This base uses a mounting hole pattern with a 4.0-inch center-to-center distance. You will need to drill your mounting plate or tube to match this pattern. All necessary mounting hardware is included with the base for installation.

    Is installation of the Starlight Instruments 3.0" Base difficult?

    Installation is straightforward for those building a custom telescope. It involves marking and drilling holes based on the 4.0" pattern, attaching the base with the included hardware, and then threading on the A30-1903-1 adapter ring and focuser. The leveling screws are then used for final collimation of the optical train.

  • Focuser Compatibility 3.0" Feather Touch Focuser
    Base Type Flat
    Mounting Pattern 4.0" Center-to-Center
    Required Adapter Ring A30-1903-1 (M109x1 Thread)
    Key Feature Integrated Leveling Screws

    • 3.0" Base Flat w/ Leveling Screws

      × 1

    • Mounting Hardware Set

      × 1

  • Starlight Instruments 2-Year Warranty