What is the primary use for the Player One M54M-M54F 20mm Adapter?
This adapter serves as a rigid extender to help achieve the correct back focus distance in an imaging train. It is commonly used to connect a camera to a filter wheel or an off-axis guider to a telescope's focuser, adding exactly 20mm of spacing to meet the requirements of a flattener or reducer.
How do I know if I need a 20mm adapter for my Player One camera?
You need to calculate the total back focus of your optical train. Start with the back focus requirement of your flattener or reducer (e.g., 55mm). Then, subtract the back focus of your camera and any accessories like filter wheels or off-axis guiders. If the remaining distance is 20mm, this adapter is the correct component to complete your imaging train.
I'm using a Celestron EdgeHD with a 0.7x reducer and need to achieve 146mm of back focus. Can the Player One 20mm adapter be part of this solution?
Yes, absolutely. The 146mm back focus requirement for the EdgeHD reducer is a common scenario. The Player One 20mm adapter is often combined with other spacers (like a 50mm and various smaller rings) and accessories (like an OAG and filter wheel) to precisely reach that 146mm distance from the reducer's threads to the camera sensor.
What are the exact threads on the Player One M54 adapter?
The adapter uses the standard M54 x 0.75mm thread pitch. It has male threads on one side and female threads on the other, allowing it to function as an extension tube between two M54-threaded accessories.
Can I stack multiple Player One 20mm adapters to achieve 40mm of spacing?
Yes, you can thread two of these adapters together to create 40mm of extension. However, for longer distances, it is generally recommended to use a single, longer extension tube if possible. Using a single piece minimizes the number of threaded connections, reducing the potential for accumulated tilt in the optical train.
Will this 20mm M54 adapter cause vignetting with my full-frame camera?
The M54 thread standard has a large enough clear aperture to fully illuminate most full-frame sensors (42mm image circle) without causing vignetting. This adapter maintains that clear aperture, making it a safe choice for use with full-frame cameras like the Player One Poseidon series, provided the rest of your optical train is also designed for full-frame coverage.
