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Adapter S58-short to M54a – for all BDS Diamond Steeltrack®
This Baader Planetarium adapter directly converts the proprietary S58 dovetail ring on the drawtube of all Baader Diamond Steeltrack® (BDS) focusers to the widely used M54a male thread. It provides a secure, rigid connection point for attaching modern imaging train components, such as field flatteners, reducers, off-axis guiders, and filter wheels that rely on the M54 standard.
S58 to M54a Thread Adaptation for Baader Steeltrack Focusers
The primary function of this adapter is to bridge the gap between your high-quality Baader Steeltrack focuser and the common M54 accessory ecosystem. Mounted in the focuser's S58 dovetail ring in place of the standard clamp, it creates a robust, non-flexing male M54 thread. Baader gives its optical length as only 1 mm, preserving precious optical path length for your imaging components.
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What is the purpose of the Baader S58-short to M54a adapter?
Its purpose is to convert the S58 dovetail ring on a Baader Diamond Steeltrack® focuser to a standard male M54a thread. This allows you to securely attach accessories like correctors, filter wheels, and cameras that use the M54 connection standard.
Which focusers is this S58 to M54a adapter compatible with?
This adapter is specifically designed for compatibility with all Baader Planetarium Diamond Steeltrack® (BDS) focusers, including SCT, Refractor, and Newtonian versions which share the S58 dovetail ring.
What kind of accessories can I attach to my Steeltrack focuser using this M54a adapter?
You can attach any astronomical accessory that features a female M54 thread. This commonly includes:
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Field Flatteners and Reducers: Many modern correctors use M54 threads for a wide, unvignetted optical path.
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Filter Wheels and Drawers: Allows direct connection to popular M54-based filter systems.
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Off-Axis Guiders (OAGs): Provides a solid connection point for M54 OAG bodies.
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Camera Adapters: Connects to various camera mounting systems that terminate in an M54 thread.
Is this the correct adapter for connecting a ZWO EFW with an M54 interface to my Baader Steeltrack?
Yes. If your ZWO Electronic Filter Wheel (EFW) or other imaging accessory has a female M54 thread for connection to the telescope, this adapter will provide the necessary male M54 thread on your Baader Diamond Steeltrack® focuser.
Does the S58-short adapter add significant length to the optical path?
No. Baader gives its optical length as only 1 mm, preserving critical space for your imaging train components.
How do I install the Baader S58-short to M54a adapter?
Installation is straightforward. Baader says the adapter replaces the standard clamp and is installed with the S58 dovetail ring of your Baader Diamond Steeltrack® focuser: remove the standard clamp and mount the S58-short to M54a adapter in the S58 dovetail ring in its place.
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| Product |
S58-short to M54a Adapter |
| Compatibility |
All Baader Diamond Steeltrack® (BDS) Focusers |
| Input Connection (Focuser Side) |
S58 Dovetail |
| Output Thread (Accessory Side) |
M54a (Male) |
| Net weight (kg) |
0.01 |
| Inner Diameter / Clear Aperture (mm) |
45 |
| Type of Adapter |
Reducing Adapter |
| Optical length (mm) |
1 |
| Outer Connection (eyepiece/-camera-sided) |
M54 x 0.75 |
| Adapters Family |
M54 System |
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Adapter S58-short to M54a
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Baader Planetarium Warranty
