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Starlight Instruments 3.0" Base Curved w/ Leveling Screws

Starlight Instruments 3.0" Base Curved w/ Leveling Screws

by Starlight Instruments
SKU SI-BA30CL
CA$266.00 - CA$266.00
CA$266.00
CA$266.00 - CA$266.00
CA$266.00
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  • Custom-machined to your telescope tube's exact radius
  • Provides a solid, flexure-free mounting platform
  • Designed for 3.0" Starlight Instruments Feather Touch Focusers
  • Integrated leveling screws for precise focuser collimation
  • Requires A30-1903-1 Tube Adapter Ring (sold separately)
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  • Description
  • FAQ
  • Warranty

  • Starlight Instruments 3.0" Base Curved w/ Leveling Screws

    The Starlight Instruments 3.0" Curved Base is the definitive mounting solution for attaching a 3.0" Feather Touch focuser to a curved optical tube, custom-machined to your instrument's exact radius to eliminate any possibility of flexure or instability.

    Custom-Machined for a Perfect Telescope Tube Interface

    Unlike universal plates, this base is not a one-size-fits-all solution. Starlight Instruments machines each base to the exact diameter or radius you provide, ensuring the curvature of the base perfectly matches the curvature of your telescope tube. This creates a large, stable contact area that prevents rocking, shifting, or flexure under the weight of a heavy camera or eyepiece.

    Leveling Screws for Precise Focuser Collimation

    Achieving perfect optical alignment is critical, and this base provides the tools to do it right. Integrated leveling screws allow you to make minute adjustments to the focuser's tilt, ensuring the optical axis of the focuser is perfectly square to the telescope's light path. This precision is essential for eliminating image plane tilt and maintaining sharp, round stars across the entire field of view, especially in fast imaging systems.

    Why a Custom Curved Base Matters for Newtonian Telescopes

    While a flat base might seem sufficient, mounting it to a curved tube creates only two small points of contact, leading to instability and potential tube deformation. This custom-curved base distributes the load of the focuser and imaging train evenly across its entire surface. The result is a far more rigid and reliable connection that maintains collimation and focus, night after night.

  • How do I order the correct Starlight Instruments 3.0" Curved Base for my telescope?

    This is a custom-machined part. During checkout, you must specify the exact outer diameter or radius of your telescope tube in the order notes. Starlight Instruments will then machine the base to perfectly match your tube's curvature.

    What other parts do I need to install a 3.0" Feather Touch focuser with this base?

    This base is one component of the mounting system. You will also need the Starlight Instruments 3.0" Feather Touch Focuser and the corresponding A30-1903-1 Tube Adapter Ring, which threads into this base. Both items must be purchased separately.

    What is the purpose of the leveling screws on the Starlight Instruments Curved Base?

    The leveling screws allow you to make fine adjustments to the tilt of the entire focuser assembly. This is a critical collimation step to ensure the focuser's drawtube is perfectly perpendicular to the telescope's optical axis, which is necessary for preventing tilted image planes and achieving sharp stars across your entire sensor.

    Can I use this Starlight Instruments base with a focuser other than a 3.0" Feather Touch?

    No, this base is specifically designed to mate with the Starlight Instruments A30-1903-1 tube adapter ring, which is made for their 3.0" Feather Touch focuser. It is not compatible with other focuser sizes or brands.

    I'm building a 12" f/4 Dobsonian. Why is this custom Starlight Instruments base better than a generic one?

    For a fast imaging system like an f/4 Newtonian, mechanical rigidity and precise alignment are paramount. A generic base won't perfectly match your 12" tube's curvature, leading to instability and flexure as the scope moves. This custom-machined base ensures a perfect, full-contact fit, providing the stable platform required for critical imaging and visual work at high power.

    Will this Starlight Instruments base help reduce image plane tilt with my heavy camera on my custom Newtonian?

    Yes, absolutely. Image plane tilt is often caused by two factors: mechanical flexure and improper alignment. This base addresses both. The custom fit provides a rigid, zero-flexure foundation, while the integrated leveling screws give you the fine control needed to precisely square the focuser axis to your imaging sensor, eliminating tilt.

  • Starlight Instruments 2-Year Warranty