It think it's like a digital SLR camera lens on manual focus. you get it better and better and better and oops just a bit to far and have to dial it back..
So I am with you, while there is a perfect spot...it's not night and day if it's off a touch...just a bit better if not...
So I am with you, while there is a perfect spot...it's not night and day if it's off a touch...just a bit better if not...