What's the use of Bud's thin-film mirror cover on a telescope?

The function is to observe the sun. Astronomical telescopes must be equipped with Budd films or other filtering devices to observe the sun. Otherwise, eyes and instruments will be damaged.

Budd membrane is a kind of solar filter. Different from other similar products, Budd film can reduce light and harmful radiation without reducing the contrast of the subject. In other words, using Budd film as a solar filter can get better image quality, and even record sunspot activity on the surface of the sun easily. The appearance of Budd film is silver film.

Extended data

Precautions for use:

When in use, it is necessary to repeatedly check whether there are holes in the Bader membrane. Under strong light, even the light passing through the hole is enough to hurt people's eyes. And make sure that the Budd film solar filter is placed in front of the front lens. If it is placed at the position of the filter behind the lens, it is likely to damage the film itself and hurt the user or photographic equipment because of the accumulation of heat.

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