The OM System FCON-T02 is a circular fisheye converter lens for TG-series cameras, producing a 180° circular fisheye effect while maintaining the brightness of the camera's native lens. Switching the camera's zoom position changes the effect between circular and diagonal fisheye, giving two looks from one lens. It's compatible with the TG-7, TG-6, TG-5, TG-4, TG-3, TG-2, and TG-1, and requires the CLA-T01 Conversion Lens Adapter, sold separately, to attach.

The lens is waterproof to 20m (65ft) and filled with nitrogen gas to prevent internal fogging from temperature changes. Note that once fitted, the combined camera-and-lens waterproof, shockproof, and crushproof ratings no longer match OM System's standard in-house testing conditions for the camera alone.