The light barrier and the camera are connected via a camera adapter set. The 2.5 mm jack plug is plugged into the light barrier and the camera specific plug is plugged into the remote control plug of the camera.
The camera adapter sets have a length, depending on the type, of 2.5 m up to 5.2 m, which will be the maximum distance between light barrier and camera. Please see the product specific site. This length is sufficient for insect-, waterdrop- or other kinds of photography in a tighter space. In the case of the longer version (5.2 m), it is even sufficient for bird photography.
When using a tele lens, or at a bigger distance between light barrier and camera, you will need extension cords. Extention cords can be used as many as needed, without any losses.
Note: For a complete list of all suitable cameras, please click on the green link or on the picture of the camera adapter set.