The important thing about solar observing is the f ratio.  I you have a big dob at f6 - like my old 22 inch - the image has a bunch of energy, but that energy goes into a larger image and so is not as concentrated.  An f4 dob has much more concentrated energy at the prime focus than an f6.  I believe you need an f2 to start a fire, but any aperture will fry an eyeball.  A large dob can be used to observe the sun with the proper accommodations. Let's not talk about the time I aimed the 22 inch at the sun. Brent On Thursday, June 8, 2017 6:59 PM, Siegfried Jachmann <siegfried@jachmann.org> wrote: With a small Newtonian it would be perfectly safe to project an image through the eyepiece to a piece of shaded white paper. You however should use only cheaper non-cemented eyepieces.  If your reflector is bigger than 6", be sure to stop it down. You don't want to cook an eyepiece. Always exercise extreme caution with the Sun. The Sun does not forgive stupidity or carelessness. Eyes do not react well to sunlight concentrated through a telescope. Matt and Chuck are exactly right in their advice. On Jun 8, 2017 6:45 PM, "Joe Bauman via Utah-Astronomy" < utah-astronomy@mailman.xmission.com> wrote: I would not use a Dob as a solar scope! Too dangerous! Sent from my iPhone

On Jun 8, 2017, at 5:06 PM, Sue Ellen Ebertz <ebertzs@comcast.net> wrote:

Yes, Joe, and much appreciated. I misspoke. I meant to be addressing 'Sun Parties' as there are many opportunities for weeknight sky viewing.

Maybe I can fit a telrad filter and an eyepiece filter into a borrowed Dob?

Is this possible and if not, maybe not the right way to go about viewing the sun in a Dob due to its major light collecting bucket function!

Thanks, Shoshana

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