Finally managed some shots on the water this morning in full sunshine with my 500D with 18-200mm f3.5-5.6 IS. The shots look quite good, however, I suspect I should be using a polarized filter ??
On water, it may cut reflections and that is often needed, yes.
What is a UV filter for ?
See DarkPenguin's answer.
Assuming you recommend the polarized than is a Hoya OK and if so do I get the CPL or pay more for the Pro1 Digital CPL, or even more for the Super HMC CPL ??
for a bit of background on these... In a few words, it depends.