It adjusts the eyepiece position to help achieve a clearer image. Applications: Compatible with all types of telescopes, including reflectors and refractors, for observing star clusters, the Moon, planets, and other celestial bodies. Constructed entirely of metal; no adhesive required. The metal ring features threaded attachment—secure and permanent. Designed for long-term reliability; will not loosen or detach over time. To select the correct size, measure the outer diameter of your telescope’s objective lens. For example: 127SLT (outer diameter 146 mm) requires a 160 mm solar filter; 8SE (outer diameter 235 mm) requires a 250 mm solar filter. Type: 80 mm Color: As shown Material: Metal Package Contents: 1 × Composite membrane filter Note: Color appearance may vary slightly due to lighting conditions and display settings. Measurement tolerance: ±1–3 cm.