Hi everyone, I've been lurking this site for a while, and I finally decided to join today. I've recently started taking a more serious interest in photography, and so far I'm really enjoying it. I've been reading up about basic composition and other technical aspects of photography. I've managed to understand shutter speed, aperture and ISO OK, purely from a point of view of lightness/darkness in a shot, but I'm completely lost when it comes to depth of field and focus, so if anyone could point me towards some good reading material on these subjects, I'd be very grateful. Here are some of my photos, I'd appreciate any feedback: 1. 2. 3. 4. The last one came out very noisy, and I plan to retake it at some point. Thanks in advance.