Precise brightness control for telescope viewing - Finer control than fixed transmission filters This filter provides adjustable brightness levels to optimize contrast and detail. It helps you fine tune the image without swapping filters. - Variable transmission from 1% to 40% Turn the filter housing to set the light transmission. Quick, smooth adjustments let you respond to different targets and seeing conditions. - 2 inch standard size compatibility Designed to fit 2" eyepieces and accessories, offering easy integration with common telescope setups. - Brightness reduction for clearer lunar and planetary views Reduces overall glare on the Moon and bright planets to enhance surface features and subtle details. - Durable, reliable performance for regular observing Built for routine telescope use with standard fittings, providing stable and repeatable brightness control. 2-3 practical use scenarios - Moon observing during bright phases When the Moon is fully illuminated, dial the transmission down to 1–10% to minimize glare and reveal crater patterns and mare boundaries with better contrast. - Planetary viewing with high glare For planets such as Venus, Jupiter, or Saturn, adjust the filter to 5–40% transmission to balance brightness and feature visibility, helping you discern bands, belts, and rings more clearly. - Quick target changes during a session While switching between targets (moon, bright planet, doubles), smoothly vary the transmission without removing the filter, keeping your observing flow uninterrupted.