-
Adapter M68 Male to M68 Male
This M68 Male to M68 Male adapter provides a precise 1.4 mm of optical path length, ideal for fine-tuning back focus in critical imaging setups. Each side features an M68 male thread with a 1.0mm pitch and 4 mm of length for a secure fit between components.
Precision Spacing: A 1.4mm M68 Male-to-Male Adapter
When your back focus calculation requires a small, precise adjustment, this adapter fills the gap. Its primary function is to join two female M68 threaded components, such as a focuser and a field flattener, while adding exactly 1.4 mm to the optical train. The M68 x 1.0mm threads are standard for many large-format correctors and focusers, making this a crucial part for achieving perfect star shapes to the edge of the frame.
-
What is the primary use for this M68 Male to M68 Male adapter?
This adapter is designed to connect two components that both have female M68 x 1.0mm threads, such as connecting a focuser drawtube directly to a field flattener or rotator. Its main purpose is to add a very specific 1.4 mm of spacing to achieve the correct back focus distance required by your optical system.
My imaging train is 1.5mm short of the correct back focus. Will this 1.4mm M68 adapter work?
A 0.1mm difference is generally within the tolerance for most amateur imaging setups, especially with slower optical systems (f/7 or higher). While 1.5mm would be ideal, using this 1.4 mm adapter will likely produce excellent results and is far better than having a significant spacing error. For very fast systems (f/4 or below), that 0.1mm may have a minor impact on corner star shapes.
What is the thread pitch of this M68 Male adapter?
The M68 male threads on both sides have a 1.0mm pitch and a 4 mm thread length.
Can I use this M68 adapter to connect my reducer to an off-axis guider?
Yes, if both your reducer and off-axis guider present female M68 x 1.0mm threads and you need exactly 1.4 mm of additional spacing between them, this adapter is the perfect solution. It provides a rigid, threaded connection that maintains alignment.
Is this M68 adapter suitable for a heavy, large-format camera?
Absolutely. The 4 mm thread length on each side provides a secure, load-bearing connection that is more than adequate for large CCD or CMOS cameras. Threaded connections like this are significantly more rigid and resistant to tilt than compression or slip-fit adapters.
-
| Adapter Thickness (Back Focus) |
1.4 mm |
| External Thread |
M68 Male (Pitch 1.0mm) |
| Thread Length |
4 mm |
| Kind |
Gender changer |
| Telescope-Side Connection |
M68x1 male |
| Camera-Side Connection |
M68x1 male |
-
-
Adapter M68 Male to M68 Male
× 1
- Pegasus Astro 2-Year Warranty
