im currently looking at some projectors. and i cant figure something out. if it says the native RES is 4:3 and 16:9 compatibale what does that mean? is it bad for HT , is it good? why is it important to get a native 16:9 ? if they all are compatibale with each resolution , why is the native RES so improtant? i mean - if i buy a native 4:3 which is 16:9 compatibale , why is that bad?