I just became a proud father to a baby girl. I'm trying to get nice shots of her eyes, lashes, feet, etc but i can't get close enough with my 50mm (I have a 18-200 but its not so sharp). Would it be practical to get a macro lens just for this purpose? I want sharp photos but I've also heard of difficulty in focusing (shallow DOF), difficulty to use in low light indoors and so on which makes me hesitate on spending $1k+. Any advice or thoughts on things i haven't thought about?