The Tilta Eyepiece EVF Leveling Rod Is a telescoping eyepiece support that extends from 12.5 to 28.9" in length. It features spring-loaded locking levers that enable you to set the height of the eyepiece (not included) for your comfort. The rod features a freely articulating dovetail foot that engages your EVF extension (not included) and a swivel mount where you attach it to your tripod head. This enables you to set the height and position of your EVF and have it maintain that position as you tilt your camera forward and back. This can help you create smooth and decisive camera moves as you don't have to chase the eyepiece as the camera changes orientation.