You have discovered how to get shallow depth of field and selective focus on close-up shots!!! GOod for you! Keep reading about photography, and practicing your craft. One thing is to practice making photos that rely upon split-second timing. One way is to find a chain-lin k fence, or window, or an iron fence with slats or bars, and then to take photos where people passing by, or background cars, or jets on approach to the airport, are seen right through the very middle of ONE, SPECIFIC aperture... no cheating! Or, find a place where people walking by are reflected in the window of a parked car, building, or side-view mirror. This is kind of an "old" exercise, designed to familiarize you with the exact, precise time lag your camera has...and the nice thing is that there is a clearly defined "target zone", and you get to watch the subject approach, and then decide when to press the shutter button. Some people poo-pooh the "old-school exercises"; I once knew a wrestler who did just TWO things for his workouts: he ran three miles every morning, and three miles every night, and he did 500 situps a day,every day.No weights. No Universal Gym (Nautilus was just invented and very rare back then). One of the best wrestlers I ever knew. Using 2,000 year old "training" exercises.