Simple questions. From what I can tell the Panasonic auto cap will not work with a filter installed, the JJC will. I've been going around and around on getting only the auto cap, only a filter, or both. Side note I have bunch of 46mm filters, including a B+W MRC UV, polarize, etc. So I also considered just getting a step ring and using the 46mm UV if I use one since I'll probably get the setup anyway for the polarize. I tried to think of combos in the poll so I set it up for select multiple.