Starlight Instruments 3.5" Adapter for Sky-Watcher Esprit 120/150

This adapter is designed to allow you to replace the stock focuser on a Sky-Watcher Esprit 120 or Esprit 150 ED APO refractor with a high-end Starlight Instruments 3.5" Feather Touch focuser. It creates a secure, perfectly aligned mechanical connection between the telescope tube and the new focuser.

While the stock Esprit focuser is very capable, serious astrophotographers with heavy imaging trains—including large cameras, filter wheels, and off-axis guiders—often upgrade to a 3.5" Feather Touch focuser for its exceptional rigidity and load-bearing capacity. This upgrade completely eliminates focuser sag, tilt, and image shift, which is critical for achieving perfectly round stars across the entire imaging field during long exposures.

Yes. This adapter is machined from a solid piece of high-grade aluminum by Starlight Instruments. It is engineered to be as rigid as the focuser and telescope it connects, ensuring your entire imaging train is securely supported without any flex, even when pointed near the zenith.

No, this adapter is specifically machined to fit the tube and mounting pattern of the Sky-Watcher Esprit 120 and Esprit 150 ED APO refractors only. It is not a universal adapter and will not fit other models.

No permanent modification is required. The adapter is designed to bolt directly to the telescope tube using the same mounting points as the original stock focuser. You can revert to the original focuser if you ever choose to do so.

This adapter is engineered specifically for the mounting pattern and dimensions of the Starlight Instruments 3.5" Feather Touch focuser. It is not designed to work with focusers from other manufacturers.