-
Adapter M68 Male to M48 Male
This adapter provides a robust M68 Male to M48 Male connection, featuring a 1.0mm pitch on the M68 side and a standard 0.75mm pitch on the M48 side. Both male threads have a 4mm length for secure engagement, and the adapter also has an internal M42x0.75 (T2) thread.
M68 to M48 Conversion with a 4mm Thread Length
This adapter solves a common connection problem, allowing you to attach modern M48 accessories like field flatteners, reducers, or cameras to focusers and correctors that use the larger M68x1.0 standard. The 4mm thread length on both the M68 and M48 sides ensures a solid, non-flexing fit without consuming excessive back focus, which is critical for maintaining the correct spacing in an imaging train.
Integrated M42x0.75 Internal Thread
A key feature of this adapter is the integrated M42x0.75 female thread on the inside of the M48 barrel. It accepts male M42x0.75 (T2) accessories. Standard 2-inch filters use the M48x0.75 thread and do not fit this inner thread.
-
What is the primary use for this M68 to M48 adapter?
This adapter is primarily used to connect imaging equipment with a female M48x0.75 thread (like many field flatteners, off-axis guiders, or cameras) to a focuser drawtube or corrector that has a female M68x1.0 thread. It acts as a step-down converter for your optical train.
How do I use the internal M42 thread on the M68 to M48 adapter?
The internal M42x0.75 thread accepts male M42x0.75 (T2) accessories. It does not take standard 2-inch filters, which use the M48x0.75 thread.
Will this adapter work with my Sky-Watcher Esprit focuser?
Many Sky-Watcher Esprit models terminate in a female M68x1.0 thread. This adapter allows you to convert that output to the more common M48x0.75 male thread, making it compatible with a wide range of M48-based correctors and accessories. Always confirm the thread specification of your specific focuser model before purchasing.
Is the M48 thread on this adapter the same as a 2-inch filter thread?
Yes. The M48 thread on this adapter has a 0.75mm pitch (M48x0.75), the same thread standard used by 2-inch filters. The internal M42 thread does not take 2-inch filters.
What is the optical length of the M68 to M48 adapter?
The adapter (back focus) thickness is 1.4 mm. The 4mm threads on each side screw into the mating parts and do not add to the light path.
Can I use this adapter to connect my ZWO camera to a large format corrector?
Yes, this is a perfect application. If you have a corrector that outputs an M68x1.0 female thread and you need to connect an M48-threaded accessory like a ZWO filter wheel or camera, this adapter bridges that gap.
-
| M68 Male Thread |
Pitch 1.0mm / 4mm length |
| M48 Male Thread |
Pitch 0.75mm / 4mm length |
| Internal Thread |
M42 x 0.75mm |
| Kind |
Thread converter |
| Optical length (added light path) |
1.4 mm |
| Telescope-Side Connection |
M68x1 male |
| Camera-Side Connection |
M48x0.75 male |
-
-
Adapter M68 Male to M48 Male
× 1
-
Standard 2-Year Manufacturer Warranty
