Quote:
Originally Posted by vindictive666
ive got 12 inch gso dob with an full aperture baader solar filter, it gives a great and a fantastic view i saw no need to cut dow to a smaller aperture
no overheating at all 
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If you are using Baader filter, of course there is no overheating of the eyepiece.
In my previous response I was referring to eyepiece projection, where there is no filter, and 8" or 12" mirror at full aperture will overheat eyepiece and even melt down the whole thing in case of use of cheap plastic parts