Pegasus Adapter M54 Male to M54 Male

Its primary function is to connect two astronomy components that both have M54 female threads. This is common when connecting a specific brand's focuser to another brand's field flattener or rotator, creating a solid, threaded connection while adding a precise 2.0mm of spacing.

The inside of the adapter is threaded to M48x0.75 specifications. This allows you to screw a standard 2-inch mounted astronomy filter (like a light pollution or narrowband filter) directly into the adapter itself. This places the filter inside your M54 imaging train without needing a separate filter holder.

Yes, if your calculations show you need exactly 2.0mm of additional spacing. Many reducers and flatteners require a precise back focus distance (e.g., 55mm). This adapter is a high-precision spacer used to fine-tune that distance when your existing components don't add up perfectly.

Not directly for connecting accessories. While it has an internal M48 thread, that thread is primarily for filters. The main structural threads are both M54 male. To connect an M48 accessory to an M54 focuser, you would typically need a step-down adapter, such as an M54 Male to M48 Female adapter.

The 2.0mm thickness is a precise optical distance. In astrophotography, being off by even a millimeter in back focus can result in elongated stars at the edge of the frame. This adapter provides a known, fixed spacing value that you can rely on when calculating your imaging train length.

Yes. M54x0.75 and M48x0.75 are standardized threads in the astronomy industry. This adapter should be compatible with any focuser, flattener, camera, or accessory from any brand that uses these standard threads.