Can confirm a point about Apature size and Depth of field A large Apature number = smaller apature and a large or long depth of field? This means on my lens if the max setting is 22 I will get max depth of field on that shot. So if that is correct, do I need to worry about focusing when using this apature size? If I set 22 on the lens and infinity focus will I get it all in sharp focus? If I set 3.5 on the lens the depth of field will be much smaller or shallow and therefore the focus point is critical?