Patrick ORourke

Hi everyone, filters are a little confusing to me, when do you use them? When do you use ND's? 85? polarizers? And what do they do the frame? Any help would be greatly appreciated, thank you. Patrick O'Rourke

I'm going to be shooting a film for school in 10 days and the scene is one character knocks on his friends door and my director wants a shot through the peephole...how do i accomplish that? The camera were using is a Panasonic AF-100