Eclectic Trains

I had great fun yesterday playing around with the Canon 7D camera. We hired it for its video capabilities but I couldn't resist a few still shots. Here is one taken with the aperture wide open (f2.8). This is the outer wall of my office in Bethnal Green, East London. The shallow depth of field (sdf) means that only a 20cm slither of the wall is sharp whilst the rest of the image - foreground and background - is satisfyingly soft (out of focus). SDF is also known as bokeh.