Tiny Feet

This week's photo challenge was all about focus. Since I'm in the process of re-learning and growing again in my photography, this is a good one for me. I took a few minutes before naptime today to work on my focus and I loved this shot I got of Xiomara's little feet. I want to remember every little wrinkle and curve of her feet and I think the focus in this shot does a great job with that!

Quick question for photographers, does the lens you use determine how sharp your focus is? I am using a 18-70 lens right now, and I think that is just the stock lens on the camera. I am really wanting to buy a 50mm and am wondering if that will bring in the focus a bit more?