Hallo all, I am going to Siem Reap soon and intend to buy myself ND filter and Polarizer filter. Need some tips and advise. I have 14mm F2.5 and 20mm F1.7 panny lense. 1. Are both lense having the same diameter, i.e. same filters can fit both lense? 2. Coming to second question, assuming both lense has different diameters - I am assuming polarizer is used most often on outdoor landscape / city scape shots where overexposed sky comes into question. - Does this mean that polarizer is more often used in wider angle lense, but I had also read that polarizer will not work well at certain angle for wide angle lense due to uneven sky. My question is whether the 14mm lense is considered too wide for Polarizer filter use? 3. ND filter's main purpose as I know is for shallow DOF in bright daylight or to have blurred movements in bright daylight. I would assume if I am to buy only one ND filter for either 14mm or 20mm, the 20mm would be the more suitable choice.....because we are talking about trying to create shallow DOF. 4. My local camera shop has Marumi ND8, is that a 3 stop ND? Is that useful?