I have chosen to make my own solar filter using Baader as opposed to Mylar or anything else based on these: https://physics.stackexchange.com/a/25204/6805 and http://irwincur.tripod.com/mylar_vs__baader.htm and others.
My last solar filter was the product which is no longer available direct from Celestron (I'm not even sure what it was made with).
Does "flapping in the wind" baader effect image quality? See the images below to understand what I mean...
Is it possible to achieve a better taut fitting when making my own?
As seen here
it is not flat or tight like this glass one is