A lens cap keeper can save you a lot of hassle and ensure the protection of your camera lens. Learn what its design is and how it works. You will certainly be amazed how functional this creative solution is. You need the cap to keep the lens protected from scratching and from different kinds of harmful environmental effects. However, the cap can easily get lost when you are using the camera. This can happen easily, especially if you are totally focused on catching the moment for the perfect picture and absorbed in taking pictures for hours.