An interesting idea regarding the filter, although I havent seen any reports that it causes "bigger then you might think" star images.
They're not really an issue here anyway, I've seen much worse.
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)
Carrying around my 20" obsession is going to kill me,
but what a way to go.
+ 12"LX200, MK67, Meade2045, 4"refractor