-
30mm Flattener Adapter
The 30mm Flattener Adapter establishes a precise 30 mm of optical length while converting the M80 x 0.75 thread on specific William Optics flatteners to the common M54 x 0.75 thread used by modern astronomy cameras and filter wheels.
30mm M80-to-M54 Adapter for William Optics Flatteners
This adapter is purpose-built to integrate William Optics Flat68III and Flat7A flatteners into modern imaging trains. By converting the flattener's native M80 x 0.75 output thread to the widely adopted M54 x 0.75 standard, it allows direct connection to most filter wheels, off-axis guiders, and dedicated astronomy cameras.
The fixed 30 mm optical length is a critical component for achieving the correct back focus distance. This rigid, machined spacer removes a common variable in spacing calculations, ensuring your sensor is positioned at the precise focal plane required for sharp stars across the entire field.
-
What is the primary purpose of the 30mm Flattener Adapter?
This adapter serves two key functions: it converts the M80 x 0.75 thread from a compatible flattener to a more common M54 x 0.75 camera-side thread, and it adds exactly 30 mm of optical length to help achieve the correct back focus for your imaging system.
Which William Optics flatteners is this 30mm adapter designed for?
It is specifically designed for use with the William Optics Flat68III and Flat7A flatteners, matching their M80 x 0.75 output threads.
How do I know if I need this 30mm adapter for my imaging train?
You need this adapter if your imaging train requires exactly 30 mm of spacing between your Flat68III or Flat7A flattener and your next M54-threaded accessory to achieve the total back focus distance. Always calculate your complete optical path length to confirm this component provides the correct spacing for your specific camera and accessories.
What are the exact thread sizes on the 30mm Flattener Adapter?
The adapter has female M80 x 0.75 threads on the telescope/flattener side and male M54 x 0.75 threads on the camera side.
Does this 30mm adapter affect the optical correction of my flattener?
No, the adapter contains no optical elements. It is a purely mechanical spacer designed to position your camera sensor at the correct distance where the flattener's optical correction is optimal. Using incorrect spacing will result in poor field correction and elongated stars.
Can I use this 30mm adapter with a filter wheel on my William Optics GT81 telescope?
Yes, this is a common application. If you are using a William Optics GT81 with a compatible flattener like the Flat68III, this 30mm adapter connects the flattener to an M54-threaded filter wheel. You must still account for the optical thickness of the filter wheel and any other spacers to ensure you hit the total required back focus distance.
-
| Telescope Side Thread |
M80 x 0.75 |
| Camera Side Thread |
M54 x 0.75 |
| Optical Length |
30 mm |
-
-
William Optics 2-Year Warranty
