OM System TCON-T01 1.7x Tele Converter for Tough Cameras

The TCON-T01 is an afocal converter that sits in front of the lens, so unlike a rear teleconverter it takes nothing off the maximum aperture. It multiplies focal length by 1.7x, taking the long end of a Tough camera from 100mm equivalent to 170mm.

It clips on and off underwater to a depth of 15m, which matters because the reach you want on a wall dive is not the reach you want in a swim-through. Fitting needs the camera's accessory thread, so pair it with the LB-T01 barrier if your body does not already have one.