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Starlight Instruments 1.25" Base Curved w/ Leveling Screws

by Starlight Instruments
SKU SI-BA15CL
CA$196.00 - CA$196.00
CA$196.00
CA$196.00 - CA$196.00
CA$196.00
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  • Custom-machined to your telescope's tube radius
  • Integrated leveling screws for precise focuser collimation
  • Designed for 1.25" Starlight Instruments Feather Touch focusers
  • Features a 1.9″ center-to-center mounting hole pattern
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Starlight Instruments 1.25" Base Curved w/ Leveling Screws

    This custom-machined Starlight Instruments base provides a solid, precisely aligned foundation for any 1.25" Feather Touch focuser on a curved-tube telescope. The mounting hole pattern is drilled to a 1.9″ center-to-center spacing, ensuring a secure, non-flexing fit to your optical tube assembly once you provide your tube's specific dimensions.

    A Custom-Machined Base with a 1.9" Hole Pattern

    Achieving perfect focuser alignment begins with the mechanical interface to the telescope. This base is custom-machined to the exact radius or diameter of your optical tube, creating a flush, stable connection that a generic or flat base cannot replicate. This bespoke fit is the first step in eliminating tilt and ensuring your entire imaging train is perfectly orthogonal to the light path.

    The integrated leveling screws are the critical second step, allowing for fine-tuning of the focuser's orientation. By making minute adjustments, you can collimate the focuser with extreme precision, removing any residual tilt from the optical axis. This capability is essential for astrophotography, where even slight misalignment can result in distorted stars at the edge of the field.

    • Custom Radius: This base is not a one-size-fits-all solution. It is machined to the specific diameter or radius you provide in your order notes, guaranteeing a perfect match to your telescope's tube.
    • Leveling Screw Adjustment: Three built-in screws allow you to precisely adjust the tilt of the focuser, ensuring the eyepiece or camera sensor is perfectly square to the incoming light.
    • Feather Touch Compatibility: Designed specifically as the mounting platform for Starlight Instruments' 1.25" Feather Touch focusers.

  • How do I order the Starlight Instruments 1.25" Curved Base for my telescope?

    Because this is a custom-machined part, you must specify the outer diameter or radius of your telescope tube in the notes section when you place your order. This ensures the curve of the base perfectly matches your instrument for a secure, flush fit.

    What is the purpose of the leveling screws on this 1.25" Starlight Instruments base?

    The leveling screws are for focuser collimation. They allow you to make microscopic adjustments to the tilt of the focuser body after it's mounted. This ensures that your camera's sensor or your eyepiece's field stop is perfectly perpendicular to the telescope's optical axis, which is critical for achieving sharp stars across the entire field of view.

    Will this Starlight Instruments base fit my 8" f/10 Schmidt-Cassegrain?

    No. This base is designed for telescopes like Newtonian reflectors or custom refractors where the focuser mounts directly onto the curved surface of the main tube. Schmidt-Cassegrain telescopes use a different mounting system on their rear cell and do not require this type of base.

    I am building a custom 10" f/4 Dobsonian. Is this the right base for a 1.25" Feather Touch focuser?

    Yes, this is the ideal base for your project. When ordering, you would provide the outer diameter of your 10" tube, and Starlight Instruments will machine the base to that specific curvature. The 1.9" mounting hole pattern provides a standard for drilling the tube.

    What is the mounting hole spacing for the Starlight Instruments 1.25" Curved Base?

    The base uses a standard 1.9″ center-to-center mounting hole pattern. You will need to drill your telescope tube to match this spacing to install the base.

    Why is a curved base necessary for my Newtonian telescope?

    A curved base matches the contour of your telescope's tube, providing a stable, rock-free connection. A flat base on a curved tube would only make contact at a single point, creating an unstable mount that could introduce flexure, tilt, and alignment problems.

  • Focuser Compatibility 1.25" Starlight Instruments Feather Touch Focusers
    Mounting Type Curved Base with Integrated Leveling Screws
    Mounting Hole Pattern 1.9″ (center-to-center)
    Machining Custom (Requires user-provided tube radius or diameter)

    • 1.25" Curved Base w/ Leveling Screws

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  • Starlight Instruments 2-Year Warranty