UV Filters

Define "need".

Digital cameras aren't sensitive to UV. Film cameras are, but there's probably not much UV around in a studio unless you have a fairly unusual lighting setup.

So the only reason for a filter is for protection. If you were photographing indoor paintballing, say, a filter might be useful. If you have a habit of poking your fingers or other objects into the front of the lens, ditto. But otherwise no.
 
Echoing the above, buy one, fit one, forget about it. It won't significantly affect the results and is cheaper than dirtying or scratching your lens front element.
 
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