The Hoodman Cinema Strap is designed to be used with your HoodLoupe to attach it to your camera when shooting video or still images with an HDSLR. First remove the original rubber O-ring and lanyard from your HoodLoupe. Next, place the new two eyed O-ring in the groove where the original O-ring was fitted. Third step, position the HoodLoupe over your LCD screen and wrap the rubber cords around your camera body. You can snake the rubber cords to avoid controls. Lastly, tighten your rubber cords. Cord locks are released by squeezing buttons and sliding the cord through the lock to the desired position. Excess rubber cord can be trimmed with scissors for a clean fit.