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Adapter M48i to T-2a
The Baader Planetarium Adapter M48i to T-2a provides a simple, robust solution for connecting accessories from two of astrophotography's most common thread standards. This adapter allows you to attach a component with a male M48 thread to an element in your imaging train that requires a male T-2 thread. It is an essential "problem-solver" for integrating filter wheels, off-axis guiders, and cameras that would otherwise be incompatible.
Bridging M48 Female and T-2 Male Connections
This adapter is specifically designed to screw onto a male M48 thread and present a male T-2 thread. This is a common requirement when, for example, connecting a T-2 based camera or off-axis guider to the output of a filter drawer or flattener that terminates in an M48 male thread. As part of the comprehensive Baader Astro T-2 System, this component is precision-machined to ensure a secure, light-tight fit with minimal added optical length, preserving your critical back focus.
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What is the primary function of the Baader Adapter M48i to T-2a?
Its function is to convert a female (internal) M48 thread into a male (external) T-2 thread. This allows you to physically connect components from these two different but common threaded systems in astrophotography.
Can I use the Adapter M48i to T-2a to attach my 2" filter wheel to a T-2 focuser?
It depends entirely on the specific threads of your equipment. This adapter screws onto an M48 male thread and provides a T-2 male thread. If your filter wheel has an M48 female port on the telescope side and you need to connect to a T-2 female port on your focuser, this is the wrong adapter. Always verify the gender (male/female) of the threads you need to connect.
Will this Adapter M48i to T-2a add a lot of length to my imaging train?
While any adapter adds some optical length, this component is engineered to be as low-profile as possible. Its purpose is to solve a connection problem with minimal impact on your available back focus.
What do "M48i" and "T-2a" mean on the Adapter M48i to T-2a?
The naming convention describes the adapter's function:
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M48i: Refers to an M48 internal (female) thread. This is the side that screws onto the male M48 thread of your existing component.
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T-2a: Refers to a T-2 external (male) thread. This is the side that is presented for the next component in your train.
Is this the right adapter to connect my T-2 camera to an M48 field flattener?
This is a common scenario, but you must check the threads on your flattener. If your flattener has an M48 male thread on the camera side, this adapter will screw onto it and provide the male T-2 thread needed to attach your T-2 camera. If your flattener has an M48 female thread, this adapter will not work.
Are M48 and 2" filter threads the same standard?
Yes, in astrophotography, the M48 thread standard (M48x0.75mm pitch) is the same thread used on standard 2-inch astronomy filters. This adapter is compatible with that standard.
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| Input Connection |
M48 Internal Thread (Female) |
| Output Connection |
T-2 External Thread (Male) |
| Net weight (kg) |
0.01 |
| Inner Diameter / Clear Aperture (mm) |
39 mm |
| Outer Diameter |
52 mm |
| Type of Adapter |
Reducing Adapter |
| Optical length (mm) |
1 mm |
| Outer Connection (eyepiece/-camera-sided) |
M42 x 0.75 (T-2) |
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Baader Planetarium Warranty
