UV filter help?

[ffonsok]

Hey-
I got a DVX100, and I am looking at a UV filter
http://cgi.ebay.com/TIFFEN-72mm-UV-HAZE-Protection-Filter-fits-DVX100_W0QQitemZ230105319882QQcategoryZ67354QQrdZ1QQcmdZViewItem

how does this worK? does it go on over the lens? How does this protect the lens?

thanks and sorry if this is a noobish question
nathan

 

[bilgami]

it screws on to the front of the lens im guessing you dont have the wide? it protects the lens from dust and stuff.