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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" Adapter 3" for Older TMB105 (NON-APM Version) Telescopes
Starlight Instruments 3.0" Adapter 3" for Older TMB105 (NON-APM Version) Telescopes

Starlight Instruments 3.0" Adapter 3" for Older TMB105 (NON-APM Version) Telescopes

by Starlight Instruments
SKU SI-A30-1903-12
$250.00 - $250.00
$250.00
$250.00 - $250.00
$250.00
Price Match Policy!
  • Connects Starlight Instruments 3.0-inch focusers to older TMB105 telescopes
  • Specifically for non-APM versions of the TMB105 refractor
  • Precision-machined aluminum for a secure, no-flex connection
  • Enables a critical upgrade for modern astrophotography and precise visual use
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Starlight Instruments 3.0" Adapter 3" for Older TMB105 (NON-APM Version) Telescopes

    This Starlight Instruments adapter provides the essential mechanical connection to upgrade an older, non-APM TMB105 refractor with a modern 3.0-inch Feather Touch focuser. It creates a solid, precisely aligned interface between the optical tube and the focuser, enabling the zero-image-shift precision required for critical astrophotography with heavy camera payloads.

    Upgrade Your TMB105 with a 3.0-inch Feather Touch Focuser

    The TMB105 is a classic apochromatic refractor prized for its superb optical quality. This adapter allows you to match those optics with the mechanical excellence of a Starlight Instruments Feather Touch focuser. By replacing an aging or less robust stock focuser, you eliminate flexure and image shift, ensuring your imaging train remains perfectly orthogonal to the focal plane.

    Machined from high-grade aluminum with the tight tolerances Starlight Instruments is known for, this adapter ensures a secure, direct fit to the TMB105 optical tube. This is a vital upgrade for any owner looking to use their classic refractor for serious deep-sky imaging or demanding high-magnification visual observation.

  • What Starlight Instruments focuser does this 3.0" adapter for the TMB105 fit?

    This adapter is designed to connect to the Starlight Instruments family of 3.0-inch Feather Touch focusers, such as the FTF3015, FTF3025, and FTF3035 models. It provides the telescope-side connection for these specific focusers.

    How can I determine if my TMB105 is the older "NON-APM Version"?

    This refers to the original production runs of the TMB105 before APM Telescopes took over manufacturing. These earlier models often have different rear cell threadings and mechanical dimensions. If you are unsure of your telescope's origin, it is best to measure the rear cell threads or contact Starlight Instruments directly for confirmation before purchasing.

    Why do I need to upgrade the focuser on my TMB105 for imaging the Andromeda Galaxy (M31)?

    Imaging a large target like the Andromeda Galaxy (M31) often involves a heavy imaging train consisting of a full-frame camera, a filter wheel, and an off-axis guider. The stock focuser on an older telescope may not be able to support this weight without flexing or slipping. Upgrading to a 3.0-inch Feather Touch focuser using this adapter provides the load capacity and stability needed for long, unguided exposures that result in perfectly round stars from edge to edge.

    Will this Starlight Instruments adapter fit the newer, APM-produced TMB105?

    No. This adapter is machined specifically for the thread pattern and dimensions of the older, non-APM TMB105 telescopes. It is not compatible with the versions manufactured by APM Telescopes.

    What is the visual benefit of a Feather Touch focuser on my TMB105?

    Beyond imaging, a Feather Touch focuser dramatically improves visual observation. The dual-speed 10:1 fine focus knob allows for extremely precise focusing adjustments. This is critical for achieving the sharpest possible views at high magnification when observing fine details on Jupiter's cloud bands or attempting to split tight double stars like Epsilon Lyrae.

    Is this adapter the only part I need for the upgrade?

    No, this product is the adapter only. You must purchase a compatible 3.0-inch Starlight Instruments Feather Touch focuser separately to complete the upgrade for your TMB105 telescope.

  • Manufacturer Starlight Instruments
    Telescope Compatibility Older TMB105 (NON-APM Version)
    Focuser Compatibility Starlight Instruments 3.0" Feather Touch Focusers
    Adapter Type Telescope to Focuser Adapter
    Material Anodized Aluminum

    • 3.0" Adapter for Older TMB105 (NON-APM Version)

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  • Starlight Instruments 2-Year Warranty