7" F5.7 Mark Harry mirror dob (self made) TMB 6MM, 8,13 Ethos, 22T4, 27 Pan, Meade 36QX 10" F5 Swayze refigured mirror waiting for a home
Quote:I have a helical focuser so changing focus didn't change it, so can't be the eyepiece.
Quote:I think maybe it could be coming from the edge of my secondary which I haven't gotten around to darkening.
"If I say something in the forest and my wife isn't there to hear it, am I still wrong?"
20" homebuilt truss dob 6" watson refractor
"A craftsman relies on science when knowledge allows it, tradition and experience when it does not, and makes art whenever he can." 14 built scopes from 4.25 to 18" and a 24" in (perpetual) progress. 15 ATM awards. Co-mounted CPC 1100 EdgeHD/TAK FS-102/Orion ED80T on a trash-cart for when I'm feeling lazy. "Simple minds discuss people. Good minds discuss events. Great minds discuss telescopes." http://stardazed.com/
Quote:Hello: I have seen things similar to what you describe. In my case, it was caused by a heat plume from the center of my Cassegrain primary mirror. I saw a short spike or flare to only one side, that was changing slowly like slow seeing. If you go way out of focus (until you see a big donut), you can see the source of the heat plume. CheersMike