Hello everyone Newbie question. I recently purchased my first Nikon DSLR (D7000) + sigma 17-50 2.8. I would like to seek your help if what is the most appropriate AF mode (AFA, AFS, AFC) as i'm taking pictures of my kids (3 and 6 y/o) with nice sceneries (Landscape). I know that using aperture of 2.8 will blur background and going to F8 to F11/16 will focus a lot. My question is what AF mode is appropriate to use and where to focus as I want the whole sceneries and kids to be sharp. which is more suitable single point AF or autofocus AF in this scenario. Thank you very much.