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Regarding showing the sun: I saw a film about John Dobson, he had made an elegant solar scope with the sonotube cut at 45 degrees, and a plate of welding glass covering the front. No secondary per se, just the back of the glass. He was showing people at a state park, getting ooohs and ahhhs.

"Thank You for showing me that!" one person exclaimed.

"Oh, don't thank me," said Dobson. "It's your sun."

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I made one of these Dobsonian Solar scopes in John's class back in 1985. Actually a friend made the mount and I just ground the mirror. The welding glass sits inside the focuser hole. The front is parallel plate glass aluminized on the inside. The mirror is unaluminized. Love it! http://www.whiteoaks.com/sketches/janesketch2.html

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Jane Houston Jones
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