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An affordable way to put a filter on your X100 is to take an old filter, remove the glass and use it as a distance ring.
The problem is that the original cap won´t snap onto the lens anymore. With this simple adaptor ring you can still use the original camera cap of you Fujifilm X100 even if you screw the cover ring back on.
I used the strong an flexible material in black an it works pretty good. The metallic plastic might look good on the silver version of the camera, but you will be the first to try :)