Ever since I bought my OMD last year, I shoot entirely without a lens hood. Therefore, I have no real life experience on the advantage of a lens hood. From forums and internet, I know that it helps to prevent lens flare and serves as a lens protection. I recently bought the 12-40mm. I am going to buy ND filters for my 12-40mm for landscape/cityscape photos. I am thinking of buying the standard filter size (77mm) due to a couple of reasons (can be used for future lens sizes; easier to sell etc…) However, its means that I will not be able to use the 12-40mm lens hood together with the 77mm ND filters. Does the ND filter fulfill the purposes/advantages of the lens hood or is it better and advisable to use both together to achieve better landscape photos. Seeking kind advice and many thanks in advance.