ASToptics M48 to 1.25″ Adapter
This compact adapter solves one of the most common problems in astronomy - connecting optics with an M48x0.75 thread to equipment with a standard 1.25″ eyepiece input. It converts an M48x0.75 male thread to a 1.25″ barrel, so you can combine different accessories without any improvised solutions.
The optical length of the adapter is just 1 mm. This means it has virtually no effect on focus travel or the light path. Overall dimensions of 50 x 50 x 26 mm make it easy to handle, even during night-time observing sessions.
Built-in filter thread
The 1.25″ barrel includes an internal M28.5x0.6 filter thread. You can screw any standard 1.25″ astronomy filter directly into the adapter. There is no need to choose between using an eyepiece and using a filter - you can combine both without any additional accessories.
This is a detail that visual observers and astrophotographers will both appreciate. It makes building your optical chain faster and more convenient.
Who is this adapter for?
The ASToptics M48 to 1.25″ adapter is a practical choice for anyone who works with M48x0.75 optics and wants to use standard 1.25″ accessories. It is suitable for both visual observing and astrophotography with 1.25″ filters and eyepieces.
Technical specifications
| Parameter |
Value |
| Input thread |
M48x0.75 (male) |
| Output barrel |
1.25″ |
| Filter thread |
M28.5x0.6 (internal) |
| Optical length |
1 mm |
| Overall dimensions |
50 x 50 x 26 mm |
