Glossary | Telescope accessories | General | Series | SF 100

The German manufacturer euro EMC offers solar observation filters under the name SF 100. The filter material is Baader's much proven AstroSolar film with an optical density of 5 - ideal for safe visual observing.

Here's how it works: The film is framed by two aluminium rings. The frame can then be firmly attached to the front opening of the telescope by means of adjustable pins. In this way, the intense light from the Sun does not even get into the optics.

Which filter fits your telescope? The selection list (PDF) or the table below show you all the available filter sizes. For each size, you can see the outer diameter measurement to which the filter can be attached.

It is not possible to determine the filter size directly from the telescope aperture, since a dew shield is attached to many instruments. So it's best to measure the outside diameter of your telescope yourself.