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Cylindrical metal adapter with internal threads at both ends

Baader Planetarium

Baader Planetarium 2" Female SCT to M41.5x1 Female Reducing Adapter

SKU CH-K5MQ-15K03

Converts a 2" female SCT thread to a female M41.5x1 thread for mounting accessories like the Hyperion Zoom Mark IV without extending optical length

  • Converts 2" female SCT threads to M41.5x1 female for wider accessory compatibility
  • Zero optical-length extension preserves focus accuracy for astrophotography
  • Precision machining ensures secure, stable connection protecting equipment
  • Face holes allow easy installation with pin-type wrench 2450062
  • Enables direct mounting of Baader Hyperion Universal Zoom Mark IV on M41.5 male spotting scopes

Purpose and audience

The Baader Planetarium 2" Female SCT to M41.5x1 Female Reducing Adapter connects a 2" female Schmidt-Cassegrain thread to a female M41.5x1 thread. It is built for astrophotography enthusiasts who want to mount a Baader Hyperion Universal Zoom Mark IV onto spotting scopes from brands such as Bausch & Lomb, Opticron or Kowa that have an M41.5 male thread.

Compatibility check

Verify that your telescope or spotting scope presents a 2" female SCT thread and that the accessory you intend to attach uses an M41.5x1 male thread. The adapter does not extend the optical path, so back-focus remains unchanged. An adjustable pin-type face wrench (part number 2450062) is recommended for secure installation. On some spotting scopes the thin dust cover ring on the zoom's optical nose may need to be removed for a proper fit.

Build and daily use

Precision machining gives a rigid, zero-flexure joint that keeps alignment stable during long exposures. The compact body adds no extra length to the optical train, preserving the instrument's native focus position. Two face holes allow the recommended pin wrench to tighten the connection without marring surfaces, making repeated attachment and removal straightforward in the field.

How it compares

Measured against everything we stock in Binoculars, Scopes & Sights, at today’s prices. Recalculated every night.

Price $51.99
Cheaper than about 64% of the 1,401 comparable items (median $93.99).

Specifications

No published specifications for this item yet.

Questions about this item

What threads are on the adapter and do I need any extra parts to mount it?

The adapter has a 2" female SCT thread on one side and a female M41.5x1 thread on the other. An adjustable pin-type face wrench #2450062 is recommended for installation and the thin dust cover ring on the zoom may need removal.

How do I decide between this adapter and other thread sizes?

Choose this adapter only when you need to connect a 2" female SCT thread to a male M41.5x1 thread, such as mounting a Baader Hyperion Universal Zoom Mark IV to spotting scopes from Bausch & Lomb, Opticron or Kowa.

Does this adapter add any optical length or affect focus when fitted?

The adapter converts the thread without extending the optical length, preserving focus while providing a secure, low-flexure connection for sharper astrophotography and observation.

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