Sun Spots

OK, here's the next puzzle:  How did I get this image of the sun?   Was a telescope used?  What kind of filtering would let me focus directly on the sun's surface?  Or did I just borrow the shot from someone else's photograph?   Or did I use a projection through a pinhole onto a blank surface?


Any ideas?
I will give you a hint:  You could make the same shot without buying expensive equipment.  You would have to buy something, but it would not be costly.