Use the AOI 24mm Extension Ring with the DLP-05 or DLP-06 to use the Olympus 8mm f/1.8 Fisheye lens. The AOI 24mm Extension Ring is only compatible with the Olympus PEN Style PT-EP01, PT-EP03, PT-EP05, PT-EP05L, PT-EP06, PT-EP06L, PT-EP10, PT-EP13, Backscatter Octo Housing, AOI UH-EPL10 underwater housings.