Your hood can also serve as a protection to your front element too though its main purpose is to prevent flaring from the sun.As for the filter itself it mainly serves as a protection to your lens,unless its those really high end kind like Marumi or those german made filters.These are the kind of filters will be able to make a difference but normally we just make do lor...Other than that,remember to hold on to your camera body & sometimes onto your lens also.Why?Because especially in really crowded places eg,Chinatown,there will be hordes of people around.& you do know that some people can just walk blindly & bang right into you.Just don't want to take the risk la.Cheers mate!