Introduction to Bard membrane

Baader film, its real name is "AstroSolar", and the manufacturer is "Baader Planetarium" company. Because the company is transliterated as "Baader", this solar observation film is popular among astronomy enthusiasts It is called "Bad'membrane'", which means the film of Bard Company. As a product, the name of Bard membrane only represents such a product. Its specifications are only divided into two types according to density: 3.8 and 5.0. 3.8 Mainly used for solar photography, the corresponding light transmittance is about 16/100,000. This type is used for photography equipment, and its density is not enough to protect the eyes from damage during visual viewing; one density is 5, The corresponding light transmittance is one in 100,000, which is used as a solar filter for naked eye observation. If it is used for visual observation, a density of 5.0 must be used.

Bard film is a type of solar filter. Unlike other similar products, Bard film reduces light and harmful radiation without reducing the contrast of the subject. In other words, using the Bard film as a solar filter can achieve better image quality, and can even easily record the sunspot activity on the sun's surface. The appearance of the Bard film is a silver film.