Nickbell
Registered
I have the same lens behind a zen dome port and had to mask out the writing with black tape ( I had someone with plotter / cutter cut an exact sized ring out of adhesive vinyl to cover the white lens information)which has worked well for several years now. This was in addition to the Olympus shading ring which only appears to shade possible reflections from the camera body. With both of these I have not had any problem. After viewing your images on flicker I am not sure if you used a strobe of any sort. This would help reduce the contrast ratio between the dark main subject and the bright background, which would make the reflection less visible.