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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.
Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F) Zoom Mark IV to Spotting Scopes

Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F) Zoom Mark IV to Spotting Scopes

by Baader Planetarium
SKU BAA-2454832
$58.00 - $58.00
$58.00
$58.00 - $58.00
$58.00
Price Match Policy!
  • Connects Baader Hyperion Zoom Mark IV to select spotting scopes
  • Male Thread: 2" SCT (Schmidt-Cassegrain)
  • Female Thread: M41.5x1
  • Compatible Brands: Bausch & Lomb, Opticron, Kowa
  • Zero optical length design prevents focus issues
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F) Zoom Mark IV to Spotting Scopes

    The Baader Zero Optical Length Adapter provides a direct, secure connection between the Baader Hyperion Zoom Mark IV eyepiece and spotting scopes using an M41.5x1 external thread. Its precision "zero-length" design adds 0mm to the optical path, ensuring you can reliably reach infinity focus with compatible scopes from Bausch & Lomb, Opticron, and Kowa. This adapter features a male 2" SCT thread on the eyepiece side and the specific female M41.5x1 thread required by these spotting scope bodies.

    0mm Optical Length: Maintain Critical Focuser Travel

    Spotting scopes are designed with very limited back focus, meaning there is little tolerance for accessories that extend the eyepiece outward. This adapter is engineered to be as thin as possible, consuming 0mm of optical path length. This ensures that the focal plane remains within the travel range of your spotter's focuser, preventing the frustrating inability to achieve a sharp image at infinity that can occur with generic, bulkier adapters.

    M41.5x1 Thread for Bausch & Lomb, Opticron, and Kowa

    This is not a universal adapter; it is a dedicated solution for attaching the Hyperion Zoom Mark IV to spotting scopes that feature a male M41.5x1 thread on their eyepiece port. By threading directly onto the scope's body, you create a rigid, perfectly centered connection that eliminates the flexure and potential misalignment common with universal adapters that use thumbscrews or compression rings. This solid link is essential for maintaining the optical quality of both your spotting scope and the Mark IV eyepiece.

  • What is the Baader Zero Optical Length Adapter used for?

    This adapter is specifically designed to connect the Baader Hyperion Zoom Mark IV eyepiece to spotting scopes that have a male M41.5x1 thread on the eyepiece port. It allows you to use a high-quality astronomical zoom eyepiece for terrestrial observation.

    Why is the "zero optical length" feature important for this Baader adapter?

    Spotting scopes have very little extra focuser travel. A "zero optical length" design means the adapter is extremely thin and does not extend the eyepiece position backward, ensuring you can still achieve a sharp infinity focus. Thicker, generic adapters can often prevent a spotting scope from focusing at long distances.

    Which specific eyepieces work with this Baader M41.5x1 adapter?

    This adapter is made exclusively for the Baader Hyperion Universal Zoom Mark IV eyepiece. It attaches to the eyepiece's male 2" SCT thread. It is not designed for other eyepieces.

    Will this Baader adapter fit my spotting scope?

    This adapter will only fit spotting scopes that have a male M41.5x1 thread for eyepiece attachment. It is confirmed to be compatible with specific models from Bausch & Lomb, Opticron, and Kowa. Always check your spotting scope's manual or measure its eyepiece thread before purchasing.

    How does this Baader adapter improve upon a generic 1.25" adapter for my Hyperion Zoom on a Kowa spotting scope?

    This adapter provides a direct-threaded, rigid connection. A generic adapter often relies on a simple drop-in fit with thumbscrews, which can introduce tilt and flexure, degrading the image. The Baader adapter's threaded M41.5x1 connection ensures perfect alignment and stability, preserving the optical integrity of your high-end Kowa scope and Hyperion eyepiece.

    Can I use the Baader Hyperion Zoom Mark IV for birdwatching with a Bausch & Lomb scope using this adapter?

    Yes, absolutely. If your Bausch & Lomb scope has the correct M41.5x1 thread, this adapter allows you to leverage the exceptional sharpness, contrast, and convenient click-stop zoom mechanism of the Hyperion Mark IV for high-magnification birdwatching and other daytime terrestrial viewing.

  • Application Connects Hyperion Zoom Mark IV to select spotting scopes
    Eyepiece Side Thread 2" SCT (Male)
    Scope Side Thread M41.5x1 (Female)
    Optical Path Length 0mm ("Zero-Length")
    Compatible Brands Bausch & Lomb, Opticron, Kowa-Basis-Spotters
    Net weight (kg) 0.01
    Inner Diameter / Clear Aperture (mm) 40.5
    Outer Diameter 50.8mm (2" SC)
    Type of Adapter Reducing Adapter
    Inner Connection (eyepiece/-camera-sided) M41.5
    Outer Connection (eyepiece/-camera-sided) 2"/SCT Thread (50.8mm)
    Inner Connection (lens sided) M41.5
    Outer Connection (lens sided) 2"/SCT Thread (50.8mm)

    • Baader Zero Optical Length Adapter - 2" SCT(M)-M41.5x1(F)

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  • Baader Planetarium Warranty