The EP-20 Hydrophobia Eyepiece for Select Canon and Olympus Cameras from Think Tank Photo is a required watertight accessory for your Hydrophobia rain cover. It allows you to see through the camera's eyepiece once the rain cover is installed. The EP-20 eyepiece is CNC machined out of Delrin acetal resin and features high-density foam padding. It clicks into place so you know it's sealed and secure.
Canon 5D Mark III, 1D Mark III, 1D Mark IV, 1DX, and 7D
Olympus E3 and E30
300-600 V2.0, 70-200 and Flash 70-200 rain covers