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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 True 3.0" Base Flat w/ Leveling Screws

Starlight Instruments True 3.0" Base Flat w/ Leveling Screws

by Starlight Instruments
SKU SI-BA32FL
$160.00 - $160.00
$160.00
$160.00 - $160.00
$160.00
Price Match Policy!
  • Flat base for Starlight Instruments True 3.0" Feather Touch Focusers
  • Features integrated leveling screws for precise collimation
  • 4.4" center-to-center mounting hole pattern
  • Designed for custom telescope builds with flat mounting surfaces
  • Requires A32-3203-1 Tube Adapter Ring (sold separately)
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  • Description
  • FAQ
  • Warranty

  • Starlight Instruments True 3.0" Base Flat w/ Leveling Screws

    The Starlight Instruments True 3.0" Base provides the critical mechanical interface for mounting a True 3.0" Feather Touch focuser, featuring a 4.4" center-to-center mounting hole pattern. This flat base is engineered to thread perfectly into the A32-3203-1 tube adapter ring, which utilizes M120x1 threads to connect to the focuser body, ensuring a rigid connection for heavy imaging trains.

    The Foundation for a True 3.0" Feather Touch Focuser

    For custom telescope makers and advanced imagers, a secure focuser mount is non-negotiable. This flat base serves as the foundational component for attaching Starlight's large-aperture True 3.0" Feather Touch focuser to any flat surface, such as the mirror box of a large Dobsonian or a custom-machined adapter plate.

    It is designed as part of a modular system, requiring the A32-3203-1 tube adapter ring (purchased separately) to complete the connection to the focuser. This ensures that the entire optical train, from the focuser to the heaviest camera, is supported without flexure or tilt.

    4.4" Pattern with Integrated Leveling Screws

    This base features a 4.4" center-to-center mounting hole pattern for attachment to the telescope structure. The integrated leveling screws are the key to achieving perfect optical alignment. They allow you to make minute adjustments to the focuser's tilt, ensuring its optical axis is perfectly perpendicular to the telescope's focal plane.

    This level of collimation control is essential for edge-to-edge sharpness in astrophotography, eliminating field tilt that can ruin an otherwise perfect image. The base includes all necessary mounting hardware for a straightforward installation.

  • What is the Starlight Instruments True 3.0" Flat Base used for?

    This base is designed to securely mount a Starlight Instruments True 3.0" Feather Touch focuser onto a flat surface. It's a critical component for custom telescope builds, such as large Dobsonians or instruments with custom-made mounting plates, ensuring a rigid and precisely aligned foundation for the focuser.

    What do the leveling screws on the True 3.0" Flat Base do?

    The leveling screws allow for precise collimation of the focuser. By adjusting these screws, you can fine-tune the tilt of the focuser body to ensure its optical axis is perfectly perpendicular to the telescope's light path. This is crucial for achieving sharp, uniform stars across the entire field of view in astrophotography.

    I'm building a custom 16" Dobsonian with a flat mirror box. Is this the right base for a True 3.0" Feather Touch focuser?

    Yes, this is the ideal base for your application. The flat design is made specifically for surfaces like a Dobsonian's upper cage or mirror box. It provides the stable, adjustable platform needed to support a heavy-duty True 3.0" focuser and a demanding imaging payload.

    Does this True 3.0" Flat Base include the tube adapter ring (A32-3203-1)?

    No, the tube adapter ring (part #A32-3203-1) must be purchased separately. This base threads into the adapter ring, which in turn connects to the True 3.0" Feather Touch focuser body itself.

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

    The base uses a mounting hole pattern of 4.4 inches from center to center. You will need to drill holes matching this pattern on your telescope's tube or mounting plate to install the base.

    Can I use this True 3.0" Flat Base to mount my focuser on a curved refractor tube?

    No, this model is a flat base and is not suitable for directly mounting on a curved surface. For curved tubes, Starlight Instruments offers different bases with a radius machined to match specific tube diameters. Using this flat base on a curved tube would create an unstable connection and make proper collimation impossible.

  • Starlight Instruments 2-Year Warranty