There shouldn't be any significant heat going through the baader solar film. When the scope is pointed at the sun the tube shouldn't be exposed to sunlight due to the shadow of the edge of your filter. Perhaps before you set up, your scope was sitting in the sun? The XTi dark tube would heat up rapidly exposed to the sun... I setup quickly doing solar so my tube doesn't heat up. Seeing is better in the morning anyway before it gets hot out so try that maybe. As for brightness, try a ND or polarizing filter.
Perhaps it was in the sun a while beforehand....even so, until i check it again, seems that the filter mask alone isn't going to protect the entire telescope from being "sunbathed".
I know what you're saying though about the cast shadow if it's pointing straight at the sun.
It's just that the telescope is "enclosed" and that traps heat no matter what.
I'll do some more checking again later.
By the way, thought about using a small funnel (plastic you use for oil etc) just to be able to know the telescope is pointing at the sun (when it's light comes out of the funnel onto my hand)
Edited by patindaytona, 19 September 2019 - 06:27 AM.