In article ,
says...

There is 2 ways to use a telescope to look at the sun.

1. Mount a sheet of white cardstock above the eyepiece and PROJECT the suns
image on the cardstock. I do this with my 8inch Dob and it's the safest way
to
do it.

Do this and you can do exactly what I did wth a brand new eyepiece. Melt the
inside of it as you are getting it set up. My exciting image of the sun grew
hazy as smoke started to pour out of my eyepiece holder.

2. But a full apature solar filter that goes over the front end of the
telescope.

This is a much better choice. It allow you to observe the sun directly.

Glenn