Omegon M48/T2 0 mm Adapter
This compact adapter solves one of the most common challenges when building a photographic or visual setup for a telescope - connecting standard 2″ filter thread equipment to T2 accessories or cameras. The M48 to T2 adapter converts an external M48x0.75 thread (the standard 2″ filter thread) to an internal T2 thread (M42x0.75). With an optical length of 0 mm, it adds nothing to the light path - a critical advantage when working with short focal length telescopes or when you need precise back focus control.
Zero optical length - why it matters
When you calculate back focus distance for astrophotography, every millimetre counts. The optical length of each adapter in your imaging train adds to the total distance between the telescope optics and your camera sensor. This adapter has an optical length of 0 mm, which means it simply does not exist in your calculations. You do not need to add any value for it - it is transparent to your back focus setup.
This makes it particularly useful when:
- working with fast telescopes where back focus tolerance is tight
- assembling a multi-component imaging train where you need to control the total spacing precisely
- replacing a longer adapter to reduce the total back focus distance
Where to use this adapter
Use this adapter wherever you need to connect T2 accessories directly to a focuser or filter connection with an M48 thread. Typical uses include:
- connecting a DSLR or mirrorless camera via a T2 camera ring
- attaching T2 accessories to a 2″ focuser with an M48 thread
- building a compact imaging train without unnecessary spacing
Reliable connection, compact size
The Omegon M48/T2 adapter is small and lightweight, so it fits easily in any accessory case alongside your other equipment. The threads are machined to a precise fit, giving you a firm and play-free connection. In astrophotography, even a small amount of play in a threaded joint can affect image sharpness - this adapter removes that risk.
It is a simple part, but no well-equipped astronomy accessory kit should be without one.
Technical specifications
| Parameter |
Value |
| Brand |
Omegon |
| Thread - male (input) |
M48x0.75 (standard 2″ filter thread) |
| Thread - female (output) |
T2 (M42x0.75) |
| Optical length |
0 mm |
| Compatible with |
2″ focusers with M48 thread, T2 camera rings, T2 accessories |
