Hi idor,
Many thanks for your advice.:angel: I will leave the purchase of a filter forn the time being... and see if there are many unexpected "things" that keep coming to the lens. BYT, are you a Singaporean? and what are you doing in Houston? I went to a few cities in the USA early this year (Portland, San Diego, SF, LAX, and DC). I was using my old digital camera which did not get me good results. I hope to do some shooting with my Canon S2 IS this weekend.
Benson