As you buy a lens cover, you need to know the diameter of your camera lens. There is no need of calculating or measure as they are always provided in the form of a code. That code is what will direct you to the size of lens cap you need. With the size information at your fingertips, you can now choose a cap of a diameter slightly larger than the one for the camera lens. For instance, if your lens size is 54mm, you can get a good quality cap of 56mm. The following is the list of capsizes you will encounter in the market. They includes 37mm, 62mm,67mm,77mm,41mm,39, 28, etc. The list is not comprehensive; explore our product search engine for more details!