Originally posted by Eagle_Friends Hi, I bought the same kit a few months ago.
I just ended up buying a HOYA UV Filter for fairly cheap, and stuck with that.
You want a fairly high quality UV Filter, as the cheaper ones may degrade IQ.
Filter's aren't really dependent on cameras, but rather the thread size of your lens. Those are all 52mm filters, and the K-x's kit lens is 52mm filter thread, so they should all work.
Those seem pretty cheap, but I've never used that specific one so I can't really say on quality.
I'd just buy a branded UV filter and leave it at that. It's just for lens protection mainly, although kit lenses can be picked up for about $40 on these forums anyway.