The PT pressure tuner allows for precise adjustment of the Etalon filter using an air pressure system. By making small changes to the air pressure inside a chamber within the telescope, the refractive index of the air is altered, enabling effortless and accurate tuning to the H-alpha spectral line. This ensures a uniform image with no central obstructions and provides a durable, long-lasting etalon.

The Lunt LS130MT is a versatile telescope designed for observing the Sun in H-alpha light, featuring a half width of less than 0.7 Angstrom and equipped with a B1200 blocking filter. Its standout feature is its modular construction, allowing you to easily remove the H-alpha filter and use the telescope for night-time astronomy. The system is also expandable for additional solar observation options, such as using a Herschel wedge for white light or swapping in a Ca-K module.