Imagine how convenient it would be if you can change the filter of your camera just as quickly and easily as dialing a number! This neat little SLF (Special Lens & Filter) Turret on a Holga Lens would do just that for you! There are 18 types of special effect lenses and filters on the turret. After installation of the Holga Lens, you can "dial" for your choice of filter and you are ready to shoot in no time! The product will provide a touch of "Holga" to your images.Compatible to all Canon DSLR.