The OM System CLA-T01 is a conversion lens adapter built for TG-series cameras, including the TG-7, TG-6, TG-5, TG-4, TG-3, TG-2, and TG-1. It has a 40.5mm front mount diameter, letting divers and photographers attach the FCON-T01 or FCON-T02 fisheye converter lens, or the TCON-T01 teleconverter lens, to expand shooting options beyond the camera's native lens. The mount also accepts standard 40.5mm filters, including OM System's own PRF-D40.5 protection filter. It's usable underwater to depths within the camera's own rating, though it does not fit inside the PT-059 underwater housing; underwater conversion lenses with a 52mm thread mount to the outside of that housing instead. The adapter weighs approximately 4 grams.