Hi all. I just recently picked up a ZM18 to use with my M8. I am at a loss as to whether or not I need to invest in a UV/IR filter for it. I did some research on the net and there doesn't seem to be any concensus. The lens comes with a Milich mount which is properly coded. I will be mainly using the lens for landscape type shots and general walkaround. Some people mention that this filter is required on this lens "in certain types of situations". Problem is that I couldn't find out what these "situations" may be. This filter costs a fair bit so I need to be sure that is is a genuine need and not a nice to have. Also - some say that they get by without the VF. Is this possible? Any advice is much appreciated!