I recently bought both the Oly 12mm lens and the dedicated and expensive Oly lenshood LH48. Mounted a slim 46mm UV Heliopan filter on the lens. Tried to mount the lenshood onto the lens and it will not go on. Apparently the Heliopan filter is ever so slightly bigger than the lens barrel diameter that it is prevented from fitting onto the lens. Anybody else have this issue and how did you manage it? Either I find a filter that is actually smaller than the lens barrel dimension or I put a file to the Oly lens hood. Any suggestions?