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Caution!
Can't find any info on the window tint material, but may well be worth trying.
The ETX is not a good choice for a solar telescope... any excessive heat gets reflected to the secondary and can easily cook it and the corrector, Oldfield has tried with a 5"SCT and also gets annoying reflections.
I assume the Ha filter is a 1 1/4" size? Any residual heat etc will be "trapped" inside the tube between the front filter and the Ha. The performance will be limited by the bandwidth, ideally less than 0.8 A is necessary to define the Ha light in the solar image, to show prominances etc.
Check there's no heat at the focus before chancing your camera and or your eye.
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