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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)-M44x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M44x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M44x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M44x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M44x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M44x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M44x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M44x1(F) Zoom Mark IV to Spotting Scopes
Baader Zero Optical Length Adapter - 2" SCT(M)-M44x1(F) Zoom Mark IV to Spotting Scopes

Baader Zero Optical Length Adapter - 2" SCT(M)-M44x1(F) Zoom Mark IV to Spotting Scopes

by Baader Planetarium
SKU BAA-2454835
$45.00 - $45.00
$45.00
$45.00 - $45.00
$45.00
Price Match Policy!
  • Connects Baader Hyperion Zoom Mark IV to M44x1 threads
  • Male 2" SCT thread for eyepiece connection
  • Female M44x1 thread for spotting scope connection
  • Zero optical length design prevents focus issues
  • Compatible with select Leica and classic Carl Zeiss-Jena spotting scopes
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader Zero Optical Length Adapter - 2" SCT(M)-M44x1(F)

    The Baader Zero Optical Length Adapter directly connects the renowned Hyperion Zoom Mark IV eyepiece to spotting scopes and other instruments using a male M44x1 thread. By converting the eyepiece's native 2" SCT thread to the M44x1 standard, it enables high-end astronomical zoom capabilities for specific Leica and classic Carl Zeiss-Jena spotters that would otherwise be incompatible.

    Connect the Hyperion Zoom Mark IV to M44x1 Threads

    This adapter solves a highly specific connection problem: mating the Baader Hyperion Zoom Mark IV with its female 2" SCT thread to spotting scopes that feature a male M44x1 connection thread. This standard is found on certain high-end Leica spotting scopes and classic optical systems from Carl Zeiss-Jena, allowing you to use a single, versatile zoom eyepiece for both astronomical and terrestrial viewing.

    Maintain Critical Focus with a Zero Optical Length Design

    The term "Zero Optical Length" is critical; the adapter is engineered to consume no additional back focus. Spotting scopes have notoriously limited focuser travel, and any standard adapter would likely push the eyepiece too far out to reach infinity focus. This Baader adapter ensures the eyepiece's field stop is placed at the correct focal plane, making sharp focus possible across the entire zoom range.

  • What is the primary use for the Baader Zero Optical Length Adapter (2" SCT to M44x1)?

    Its sole purpose is to connect the Baader Hyperion Zoom Mark IV eyepiece to spotting scopes or other optical devices that have a male M44x1 connection thread. This includes specific models from Leica and older equipment from Carl Zeiss-Jena.

    Will this Baader adapter work with my Leica spotting scope?

    This adapter is compatible only with Leica spotting scopes that feature an M44x1 male thread for eyepiece attachment. You must verify the specific thread on your spotting scope model before purchasing, as Leica has used various connection standards over the years.

    What does "Zero Optical Length" mean for this Baader adapter?

    "Zero Optical Length" means the adapter is designed to not add any length to the optical path. This is crucial for systems with limited focuser travel, like spotting scopes, as it ensures you can still reach infinity focus with the Hyperion Zoom Mark IV eyepiece attached.

    Can I use this Baader Zero Optical Length Adapter to connect other eyepieces?

    No. This adapter is specifically designed for the Baader Hyperion Zoom Mark IV, which has a female 2" SCT thread concealed under its rubber eyeguard. It will not work with standard 1.25" or 2" push-fit eyepieces.

    I want to use my Hyperion Zoom on a modern Kowa spotting scope. Will this Baader M44x1 adapter work?

    No, this adapter will not work. Modern Kowa spotting scopes use a proprietary bayonet mount, not the M44x1 thread this adapter is designed for. You would need a different, Kowa-specific adapter.

    How do I attach the Baader Zero Optical Length Adapter to my Hyperion Zoom Mark IV eyepiece?

    First, you must unscrew and remove the 1.25" barrel and the 2" barrel from the base of the Hyperion Zoom Mark IV. This will expose a female 2" SCT thread. The male 2" SCT thread on the adapter then screws directly into this exposed thread on the eyepiece.

  • Inner Diameter / Clear Aperture (mm) 43
    Outer Diameter 50.8mm (2" SC)
    Type of Adapter Reducing Adapter
    Inner Connection (eyepiece/-camera-sided) M44
    Outer Connection (eyepiece/-camera-sided) 2"/SCT Thread (50.8mm)
    Inner Connection (lens sided) M44
    Outer Connection (lens sided) 2"/SCT Thread (50.8mm)
  • Baader Planetarium Warranty Policy