When you use a Summitar + hood with a LTM Leica or similar, the first trouble you find is de impossibility to see correctly through the viewfinder. Among all the choices to avoid such a situation is to change the shade for the correct one: the massive "barn door" (I must confess it�s so ugly to me). Other is to bay an expensive bright line finder SBOOI. Another to use zone focusing system� and so on. Mine is very simple as you can see.