Although the sun is dangerous to obeserve with the naked eye, there are lots of interesting features that can be seen when observing it, so the the Danubia Sun Protection Foil Sheet for Astro Telescopes has been designed to make solar observation safe. It measures 20x30cm and is designed to be a single use filter which blocks out unwanted light. The foil can be cut to a specific size and needs to be placed at the objective end of the telescope, not the eyepiece end; attach it using masking tape and make sure that there is no stray light comming through from anywhere, by looking through the telescope at a random object that isn't in the sky.
