This is my first Olympus OMD series camera. I noticed that when shooting using the viewfinder, the viewfinder goes black while image is being written onto the memory card, which lasts about a second (I'm using a Sony 64G 90MB read/40MB write card). My Stylus1 and GX7 do not behave the same. Is there a setting I can modify so I can continue to compose while the last image taken is being stored? TIA for your input.