I've tried the Baader film for my 4.5" scope before but was always a
little concerned with using it making sure to check it extensively every
time before use in case it got scratched or suffered any pinholes.
I have to admit though, it is very good at doing the job in hand.
However, i'm thinking that if I'm going to get one for my 8" I might as well
get a glass one which should last the test of time (I hope!).
However, I take your point about the cost.
  