Because our weight bar is adjustable forward and back to fine tune the balance of the crane, the amount of weight will vary. A middle of the weight bar weight requirement for the 8 ft crane is 7.5 lbs. to balance just the crane with no camera and then add 1.5x the weight of the camera. I.e. if your camera weighed 10 lbs you should add 15 lbs. Just multiply the weight of your camera by 1.5 to get the added weight amount you will need. For the 12 ft crane you will need 27.5 lbs to balance just the crane then add 3x the weight of your camera. I.e. if your camera weighed 10 lbs you will need to add an additional 30 lbs.