>>3109535filters don't correspond to the focal length of your lens but the filter thread size
since your autism is turbo mode I'll spoonfeed you, the filter thread size is generally marked on the lens, and is easily google'd otherwise. The filter thread is 58mm so you need a 58mm size filter. It doesn't matter if you have your lens set to 18, 55, or anywhere in between. The filter isn't going to fall off.
