I'm loving my new EM-1 and 12-40mm f2.8 PRO. I'm just back from a Landscape workshop and I'm really keen to buy into a filter system for ND Standard and hard grads. So far I've read conflicting reviews ... Some say that Lee Seven5 filters are too short for some (unspecified) larger diameter mu-43 lenses. Others say that the grad line on 100mm filters does not suit mu-43 lenses. At times I will be wanting to use either 2 filters or 1 filter plus CPL simultaneously and avoid vignetting at the 12mm end. I'd be grateful to anyone who can help! Thanks.