Baader AstroSolar Spectroscope Filter 100mm WH

Baader Solar Filters provide a safe way to observe and photograph the sun in the best possible quality using AstroSolar® ClearWhite Safety Film OD 5.1. Many homemade filters stretch the filter material tightly to make it look like a glass filter. However, this reduces image quality and renders the filter unusable at higher magnifications. AstroSolar® Safety Film must be mounted completely free of tension to function like a highly precise, plan-polished optical window. Although this may seem contradictory to common quality perceptions, AstroSolar® must exhibit slight waves. Only when the filter material is subjected to tension from an inadequate mounting does it perform no better than a simple glass filter made from untreated window glass.