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Baader Planetarium Adapter M68a to M48a
Baader Planetarium Adapter M68a to M48a
Baader Planetarium Adapter M68a to M48a
Baader Planetarium Adapter M68a to M48a
Baader Planetarium Adapter M68a to M48a
Baader Planetarium Adapter M68a to M48a
Baader Planetarium Adapter M68a to M48a

Baader Planetarium Adapter M68a to M48a

by Baader Planetarium
SKU BAA-2458229
CA$75.00 - CA$75.00
CA$75.00
CA$75.00 - CA$75.00
CA$75.00
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  • Converts M68 Internal Threads to M48 External Threads
  • Provides a Standard Male M68 to Male M48 Connection
  • Enables Attaching 2-inch (M48) Accessories to M68 Focusers
  • Machined for a Secure, Low-Profile Fit in an Imaging Train
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Adapter M68a to M48a

    This adapter provides a critical connection between M68 and M48 threaded accessories, allowing you to integrate the widely used M48 (2-inch filter thread) standard into a larger M68 optical train. It enables you to attach components such as cameras, filter wheels, or field flatteners with M48 female threads directly to focusers or correctors that feature a female M68 thread.

    Bridge Your M68 Focuser to the M48 System

    Many high-end focusers and correctors utilize the M68 thread for its large clear aperture and rigidity. However, the vast majority of imaging accessories are based on the smaller M48 standard. This reducer adapter solves that incompatibility by presenting a male M68 thread on one side and a male M48 thread on the other.

    This configuration creates a secure, direct-threaded connection that is essential for minimizing tilt and flexure in a demanding astrophotography setup. By stepping down the thread size, it unlocks compatibility with a vast ecosystem of M48 accessories without compromising the stability of your imaging train.

  • What is the primary use for the Adapter M68a to M48a?

    Its primary function is to connect an accessory with a female M48 thread (like a camera T-ring, filter drawer, or flattener) to a component with a female M68 thread (typically a heavy-duty focuser or corrector). It acts as a thread reducer, making two otherwise incompatible parts work together.

    How do I connect my 2-inch filter wheel to a Baader SteelTrack focuser with this M68 to M48 adapter?

    You would thread the male M68 side of this adapter into the female M68 port on the drawtube of the Baader SteelTrack focuser. This leaves the male M48 thread exposed, which you can then screw directly into the female M48 thread on the telescope side of your filter wheel.

    Is this M68 to M48 adapter a 'male-to-male' or 'male-to-female' adapter?

    This is a male-to-male adapter. It has external threads on both sides: one M68 male thread and one M48 male thread. This is necessary to connect two components that both have female threads.

    Will this M68a to M48a adapter add significant length to my imaging train?

    While any adapter adds some optical path length, this type of reducer is typically designed to be as low-profile as possible. However, as the exact optical length is not specified, you must always measure and account for its contribution to your back focus distance to ensure your flattener or reducer performs correctly.

    Can I use this adapter to attach a DSLR with an M48 T-ring to my M68 threaded corrector?

    Yes, absolutely. This is a perfect use case. The M68 side of the adapter threads into your corrector, and the M48 side threads into the M48 T-ring attached to your DSLR camera body. This creates a solid, all-threaded connection from your corrector to your camera sensor.

    What is the difference between an M68 thread and an M48 thread?

    Both are common standards in astrophotography, but they differ in size and application:

    • M68 Thread: A larger format (68mm diameter) often found on high-end focusers and correctors from brands like Baader Planetarium and Takahashi. It provides a wider, more rigid connection to prevent vignetting with full-frame sensors.
    • M48 Thread: Often called the "2-inch filter thread" (48mm diameter), this is the most common standard for connecting flatteners, reducers, off-axis guiders, and camera adapters.
  • Baader Planetarium Warranty