I've just bought a Sony TRV250e. This is my first camcorder. Could anyone advise, do I need a lens filter? I read that this is required, but I enquired at my local Sony Centre and they said this was not necessary, if it was it would have been included in the bundle. Also, is it really worthwhile dishing out another £80 or so on a spare battery? Any advise on this would be most appreciated. Cheers Oracle_OSS.