PrimaLuceLab ESATTO Extension Tube

No, this extension is specifically engineered for the ESATTO 3-inch focuser series. It utilizes a proprietary dovetail coupling system designed to match the mechanical interface of those specific units.

The extension features a dovetail coupling secured by three screws spaced at 120-degree intervals. By loosening these screws, you can manually rotate your focuser to frame your shot, then lock it securely back into place.

Many astrophotography setups, particularly those using refractors, require specific back-focus distances to reach the camera's sensor plane. This 40mm extension helps bridge the gap when your focuser's draw tube doesn't provide enough physical travel to achieve focus with your specific imaging train.

Because it uses a robust, three-screw dovetail coupling system, it is designed to maintain high mechanical rigidity. When tightened correctly, it provides a stable connection that minimizes the risk of tilt or flexure, which is critical for long-exposure astrophotography.

While it can be used for visual observation, it is primarily designed for astrophotography. Its main purpose is to solve spacing issues for complex imaging trains, such as those involving filter wheels, off-axis guiders, and cameras.